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DoubleTake File Comparator Version 1.6 May 15, 1991 (formerly GoodLook) Copyright (c) 1985-1991 All Rights Reserved by John L. Dove III T A B L E O F C O N T E N T S 1. What is DoubleTake? . . . . . . . . . . . . . . . . . . 1 2. Running DoubleTake . . . . . . . . . . . . . . . . . . . 2 a. Command line arguments . . . . . . . . . . . . . . 2 b. Command Line filenames options . . . . . . . . . . 3 c. Locating DoubleTake Support Files . . . . . . . . . 3 (1) DoubleTake Environmental Variable . . . . . . 4 (2) DoubleTake "Ran-From" location . . . . . . . . 4 (3) DoubleTake Path Search . . . . . . . . . . . . 4 d. DoubleTake File Viewing Modes . . . . . . . . . . . 4 (1) Two File Mode . . . . . . . . . . . . . . . . 4 (2) Single File Mode (also known as Zoom mode) . . 4 (3) Hex Modes . . . . . . . . . . . . . . . . . . 4 (a) Hex 24-Character Mode . . . . . . . . . . 4 (b) Hex 80-Character Mode . . . . . . . . . . 5 (c) Hex Mode Cursors . . . . . . . . . . . . 5 e. DoubleTake Main Screen Features . . . . . . . . . . 5 (1) Key Help Lines . . . . . . . . . . . . . . . . 5 (2) File Line Numbers and Byte Counters . . . . . 6 (a) ASCII Mode . . . . . . . . . . . . . . . 6 (b) Hex Mode . . . . . . . . . . . . . . . . 6 (3) PrintScreen Indicator . . . . . . . . . . . . 6 (4) WordStar(tm) Mode Indicator . . . . . . . . . 6 (5) Display Special Characters Indicator . . . . . 6 (6) Blank Ignore Indicator . . . . . . . . . . . . 6 (7) Various Modes with no Specific Indicators . . 7 (a) EGA/VGA Mode . . . . . . . . . . . . . . 7 (b) Hex/ASCII Mode . . . . . . . . . . . . . 7 f. Loading a file into DoubleTake . . . . . . . . . . 7 (1) Legal Filenames . . . . . . . . . . . . . . . 7 (a) Full Pathname Support . . . . . . . . . . 7 (2) Using the Internal Directory routines . . . . 8 (a) Selecting a Filename . . . . . . . . . . 9 (b) Pre-Viewing Files . . . . . . . . . . . . 9 (c) Duplicate Filenames . . . . . . . . . . . 9 g. DoubleTake Navigation Keys . . . . . . . . . . . . 9 (1) Scroll Methods . . . . . . . . . . . . . . . . 9 (a) Opposite Scrolling . . . . . . . . . . . 10 (b) Parallel Scrolling . . . . . . . . . . . 11 (2) Key Definitions . . . . . . . . . . . . . . . 11 (3) Pop-Up Menuing System . . . . . . . . . . . . 20 4. DoubleTake Configuration Made Easy . . . . . . . . . . . 22 a. Configuration Modifications . . . . . . . . . . . . 22 b. Choosing Your Favorite Colors . . . . . . . . . . . 23 c. Configuring DoubleTake Options . . . . . . . . . . 24 d. Configuration Mode Key Definitions . . . . . . . . 25 5. DoubleTake Limitations . . . . . . . . . . . . . . . . . 27 6. Included Files (Plus Tutorial) . . . . . . . . . . . . . 28 7. Shareware and Registration . . . . . . . . . . . . . . . 29 DoubleTake File Comparator Version 1.6 by John L. Dove III Copyright (c) 1985-1991 1. What is DoubleTake? It's a side by side (actually, one on top of the other) file- compare program to locate differences in any files, particularly in source code programs. This program was previously released under the name GoodLook. DoubleTake is a bit more indicative of its functions than the name GoodLook. Here is a summary of DoubleTake features: (See the History file, DublTake.HST to see the changes between versions.) Compared lines show on the middle screen lines for direct comparison. Pop-up Menu selections or single keys to invoke options. Built-in directory routines allow you to select a file if you don't enter the names on the command line. You can even View a file in the directory, to see if it's the correct file, prior to loading it. Wildcard (*) can be used for second filename for simplicity (e.g., DT file.prg *.bak loads DT file.prg file.bak). Load new file on-the-fly while inside DoubleTake. Choice of three scrolling modes: Parallel or Opposite or ZOOMed. Highlight modes for the two compared lines include: Normal, Reverse video and Flashing. Fully configurable options: Colors, Type of Scrolling, Hex/ASCII Mode, etc. Find Next Mismatch function key to locate the next spot where the file lines differ. The search can be interrupted at any time by pressing any key. The first mismatch found is shown highlighted. Hex mode shows any file (even binary) with option to display non-printing chars (ASCII 1-31) and Graphics characters (ASCII 128-255) or to show them as periods (similar to Debug). Two Hex Modes to show a file in Debug style (24 characters on a line) and in full 80 column mode. WordStar(tm) mode to strip the high bits from characters before displaying them. (Can be entered on command line or toggled while viewing a file. Ignore All Blanks function to allow comparing files while ignoring different spacing between them. Selectable Ignore Characters to allow you to customize the characters you want DoubleTake to Ignore. ASCII Chart reference available while choosing Ignore characters. Help available at the press of [F1]. Configuration file presets can be saved to disk. Full DOS path support. DoubleTake will search your existing path to find its configuration files. DOUBLETAKE DOCUMENTATION Page 2 Simple, intuitive file movement using the keypad and assorted keys. Alternate keys are also available if you prefer to use the Function Keys. You can scroll the files independently or together. In Hex mode the files are fully scrollable forward and backward. Align function--at any time, you can bring one file up to the location of the other file. Print Screen toggle. To prevent accidental Print Screen, PrtSc is toggled off at startup. If you wish to print any screen, you may toggle PrtSc back on at any time. Zoom Feature--You can zoom either file up to full screen. Single file view mode available from the command line. EGA/VGA supported -- will use any number of lines found -- invoke the 43/50 line mode from the command line. -- toggle between 25 and 43/50 line modes on-line Shell to DOS capability allows you to return to the exact spot in DoubleTake. 2. Running DoubleTake. DoubleTake is named DT.EXE for ease and speed of use. (You may rename it to any filename you choose, but do NOT rename the help file, DublTake.HLP.) NOTE: Ensure the name doesn't conflict with other programs in your path. For example, if you have Norton's DiskTest.exe (also named DT.EXE) visible in your path, you may accidentally run DiskTest instead of DoubleTake. Just change the name of DoubleTake to any other name to accommodate this conflict. a. Command line arguments. Type at the DOS prompt: C:\DT [<File1>] [<File2>] [/w][/x][/1][/4] and press the [Return] or [Enter] key. The arguments following DT are as follows: <File1> and <File2> are optional filenames (if none is entered, you will be prompted for each). /w is an optional WordStar(tm) flag to strip the high bits from characters before displaying them (you know the funny characters you see at the end of every word in a WordStar(tm) file which was created in the Document mode.) The /w parameter is position-independent. You can put it as the 1st, 2nd or 3rd argument and it will be interpreted correctly. /1 flag allows you to use DoubleTake as a single file View program. This shows the file in full screen mode (see Zoom feature in next section.) If you forget this flag, DoubleTake will assume you want one file only if you only enter one file on the command line. If you want a DOUBLETAKE DOCUMENTATION Page 3 second file to compare, use the [Alt-N] command to load the second file in DoubleTake. /x flag starts DoubleTake in Hex mode. Default is value saved in Configuration file. /4 flag toggles the 43/50 line mode if an EGA/VGA card is installed. (if CNF file says 25, starts in 43/50, etc.) b. Command Line filenames options. If you are comparing the same filename on another disk, just enter the drive letter followed by a colon and the first filename will automatically be added to the drive letter. (e.g., DT Filename.typ B: will compare Filename.typ and B:Filename.typ.) If you are comparing a filename with its BAK file, just enter the main filename, followed by *.BAK. (e.g., DT Filename.prg *.bak will compare Filename.prg and Filename.bak). You can also refer to a different drive\path at the same time. (e.g., DT Filename.prg b:\path\*.bak will compare Filename.prg and b:\path\filename.bak) It is important that you list the *.bak filename after the complete filename. (e.g., DT File.typ *.bak is correct, but not DT *.bak file.typ.) c. Locating DoubleTake Support Files. At startup, DoubleTake searches several places looking for its help (DUBLTAKE.HLP) and configuration (DUBLTAKE.CNF) file. The first place it looks is the current drive and directory from which you entered the command to invoke DoubleTake. Next it checks to see if you have entered a SET DT environmental variable command and checks to see if its files are in that location. Failing to find them, it checks the location of the currently executing DOUBLETAKE DOCUMENTATION Page 4 DoubleTake.exe. Finally, if it has had no success, it checks any Path you have to see if its files are anywhere in the path. (1) DoubleTake Environmental Variable. Use the following command to establish an environmental variable with the DoubleTake path SET DT=C:\DOUBLETAKE\ either from the command line or in a batch file. (You can check the value of this variable at any time by typing SET and pressing [Enter].) (2) DoubleTake "Ran-From" location. In later version of DOS (3.0 and beyond), you may enter a complete path along with the name of a file to execute a file. DoubleTake will check this spot also for its configuration files. (3) DoubleTake Path Search. DoubleTake will get the Path from the environment and search each entry on the path for its files. d. DoubleTake File Viewing Modes. (1) Two File Mode: This is the normal mode for DoubleTake. Unless you specifically tell DoubleTake that you wish to view only one file (see next paragraph), DoubleTake expects two filenames which it will display one above other. (2) Single File Mode (also known as Zoom mode): This allows you to look at a single file using the full screen. You can invoke DoubleTake in the Single File (Zoom) Mode with the /1 switch on the command line or by pressing [Z] while viewing two files, and choose either [1] or [2] for the desired file to Zoom. (3) Hex Modes. Use [Alt-X] to toggle between the two Hex modes. (a) Hex 24-Character Mode. This mode displays a file in much the same way of DOS's Debug. You will see a display similar to the following. The values on the left are the hexadecimal values of the printed values on the right. (The Cursor also helps to match values since both the hexadecimal value and the printed character are highlighted in this mode.) +[Byte: 5][File 1: TESTFILE.TXT ]=========================+ 54484953 2054444F 57532032 / /56414C53 THIS SHOWS 24 ASCII VALS 54484953 2054444F 57532032 / /56414C53 THIS SHOWS 24 ASCII VALS |--------+--------+--------/ /+--------+---+---+---+---+---+---| DOUBLETAKE DOCUMENTATION Page 5 (b) Hex 80-Character Mode. This mode displays a file in all ASCII characters, 80 columns. The value of the character at the cursor on the highlighted line is displayed at the corner of the Window Box. This mode is useful for displaying a wholly ASCII file which has no line ends. +[Byte: 5][File 1: TESTFILE.TXT ]===/ /=======[Value: $54]+ This shows a whole line of ASCII values o/ /nly, with the hex va lue of the character at the cursor shown / /in the box corners. As you move the cursor, the value above r/ /eflects the current character.<cr><lf> / / |----------------------------------------/ /-------------------| NOTE: The <cr><lf> represents the printed character for Carriage Return (<cr>, a single note character) and Line Feed (<lf>, a normal video bullet character). (c) Hex Mode Cursors. The cursors in hexadecimal mode serve two purposes: 1) Show where the "Find Next Mismatch" and "Find String" functions begin searching and 2) highlight and identify the hexadecimal value of the character at the cursor. 1. Searching from the Cursor. DoubleTake begins searching from the current cursor position in each file. When it reaches a character difference between the two files, DoubleTake stops with the cursor pointing to the difference. If the difference is a minor one, just move the appropriate cursor to re-align the files and press the "Find Next MisMatch" key again. If the difference in the files is great, you may have to use the "Find String" function to locate the next point of coincidence. 2. Scrolling with the Cursors. Use the Cursor Left and Cursor Right keys to move the cursor in the files. (The [Left] key moves the cursor back toward the beginning of file 1 while the [Ctrl-Left] key moves the cursor back toward the beginning of file 2. Similarly, [Right] moves the cursor forward toward the end of file 1 while the [Ctrl-Right] key moves the cursor forward toward the end of file 2.) As you scroll forward or backward in the file, the lines will automatically scroll forward or backward. For example, at the beginning of the file, as you move to the end of the 80-character line (byte 79), the next press of the Cursor Right key will cause the display to scroll forward to the next line in the file and the Byte Counter will show 80. Similarly, if you press Cursor Left, it will scroll back to line one, with cursor pointing to byte 79. e. DoubleTake Main Screen Features. (1) Key Help Lines. On the last two lines of the screen, you'll find an abbreviated list of the keys available in the current mode. For more detailed list of keys, press [F1] for DOUBLETAKE DOCUMENTATION Page 6 the Help screen. There is a specific key help line for Two-File mode, and for File 1 and File 2 in their Zoomed modes. (2) File Line Numbers and Byte Counters. (a) ASCII Mode. The line numbers represent the actual line number of the line in the file you are viewing. These numbers are shown at the top (or bottom) of the viewing window. When you find mismatches, you can make a note of this line number to make it easier to find it when you go into your editor. Lines longer than 80 characters are "wrapped" to the next line. You can tell a continuation line because it has the same line number as the first part of the line. Notice that in Hex Mode, this is the Byte that the cursor is highlighting. If there is no highlight, then the Byte number represents the character at the beginning of the Highlight Line. (b) Hex Mode. The byte counter for each file keeps track of the file pointer. All Finds or Find Next Mismatches start at this point. When you move from line to line, the byte pointer is reset to the beginning of the line (e.g., 0, 24, 48, or 0, 80, 160, etc, depending on the Hex mode). As you move the cursor in either file ([Ctl-Left], [Ctl-Right], [Left], [Right], [Shift-Ctrl-Left] or [Shift-Ctrl-Right]), the byte counter will be incremented or decremented to reflect the current file pointer position. (3) PrintScreen Indicator. Note the PrtSc indicator, a Paragraph symbol (the backwards P). If the Paragraph symbol is highlighted (or ON), then PrtSc is enabled (i.e., if you press [Shift-PrtSc] the screen will be printed), if in normal video, PrtSc is OFF. (4) WordStar(tm) Mode Indicator. The WordStar(tm) Mode Indicator indicates WS:[O]n or WS:[O]ff. The brackets around the "O" mean you may press the [O] key to toggle this mode On or Off. (5) Display Special Characters Indicator. The Display Special Characters Indicator displays a highlighted [D] to indicate that Display Special characters is on, and a normal [D] to indicate that Special Characters are to be displayed as periods. (6) Blank Ignore Indicator. The Blank Ignore Indicator (which is really a Character Ignore Indicator, since you can specify which characters you wish to ignore) will display a highlighted [B] to indicate that Ignore Blanks is on, and a normal [B] to show that all characters (plus any other characters you've chosen to ignore--See Customize section to see how to add other Ignore Characters) will be recognized while checking for mismatches or while doing a "Find String." DOUBLETAKE DOCUMENTATION Page 7 (7) Various Modes with no Specific Indicators. Some modes are obvious without the need for on-screen indicators. You will know the mode immediately by the look of the screen: (a) EGA/VGA Mode: You will be able to tell the type of Screen mode you're in by the appearance of the files on screen. In the EGA/VGA (43/50-line) mode, you will see 19/22 lines per file in the Two File Mode and 39/45 lines per file in the Single File Mode. If you have your EGA/VGA card in the 43/50 line mode when DoubleTake is run, you do not need the /4 switch--DoubleTake will automatically use all 43/50 lines. You may only specify 43/50 line mode, however, when entering the argument from the command line mode, but DoubleTake will find and use the total number of lines available, for any of the following: 25,35,43 or 50. While viewing a file, you may also toggle between the 43/50 and 25 line modes using the [E]GA/VGA option. (Even if you opt for normal 25 line viewing, DoubleTake detects the EGA card and sets the Video Speed to Fast.) (b) Hex/ASCII Mode. You will be able to easily determine whether your files are in Hex or ASCII mode. In the Hex mode, you will be able to easily tell if the file is being viewed in 24-Character Mode or 80-Character Mode. f. Loading a file into DoubleTake. DoubleTake requires at least one filename. If you don't enter the filename on the command line, DoubleTake will prompt you for them. If you can't remember the filename--don't panic--just press the [F1] key to get a complete listing of the files in the current directory. If you wish to change directories, just place the highlighted cursor on the desired subdirectory or parent directory and press [Return] to move to that directory and see the files. (1) Legal Filenames. Here are a few rules about entering filenames: (a) Full Pathname Support: DoubleTake supports full pathname designations, (including period and double period directory names). Here are the requirements for entering filenames: - Wildcards for file 2. Both * and *.* mean use the File 1 filename along with any new drive\path entered. For example: DT C:\WP\FILE.TYP D:\* is equivalent to: DT C:\WP\FILE.TYP D:\*.* DoubleTake will try to load: DT C:\WP\FILE.TYP D:\FILE.TYP - New Drive or Path. You may use the File 1 as File 2 with a new drive\pathname\ by just entering the drive\pathname\ as File 2 (which means you never need to use the * or *.* mentioned above, DOUBLETAKE DOCUMENTATION Page 8 doesn't it? Oh, well.). (See next note for the rules for entering pathnames.) For example, DT C:\WP\FILE.TYP D: will Look at FILE.TYP and D:FILE.TYP DT C:\WP\FILE.TYP D:\PATH\ will looks at C:\WP\FILE.TYP and D:\PATH\FILE.TYP - Paths MUST end in \. If you enter a path alone as File 2, DoubleTake assumes you mean a filename. (2) Using the Internal Directory routines. If the filename is not found or if there is a problem opening the file, you will get an error message and the chance to re-enter the correct filename. You will see the following prompt for each file: +================================================================+ | | | Enter [Esc] to Exit, [F1] for File List, [F10] to configure, | | | | or any other key to enter directly . . . | | | +================================================================+ Press the [Esc] key to exit DoubleTake and return to DOS. If you wish to see the files on the logged drive and directory, press [F1]. To immediately go to the Configuration Function, press [F10]. To type in the filename directly, press any other key. You'll get a 35 character typing area to enter your filename. (If you press a legal character, that character will be entered as the first character of the filename.) NOTE: If you intend to use DoubleTake to view only one file and forget the /1 switch on the command line, just enter /1 as Filename Number 2 to enter the Single File mode with just Filename One. DOUBLETAKE DOCUMENTATION Page 9 (a) Selecting a Filename. If you press [F1] you will see a screen similar to the following: +[Arrow Key=>Move Cursor][<-'=>Select][<Space>=>Enter directly ]=+ | | | ParentDir <Dir> ENTITLED.WK1 3K PRINTER.DOC 14K | | A:\ Drive <Dir> EPSON.SLT 6K PRINTER.TST 9K | | B:\ Drive <Dir> EPSONIC.DRV 13K PTR.LST 2K | | C:\ Drive <Dir> FIXBIOS.EXE 1K README.1 1K | | D:\ Drive <Dir> UTILS\ <Dir> README.2 1K | | AUTHORS.DOC 41K GRAPHDOC.PRN 108K README.3 1K | \/\/\/\ \/\/\/ | | |=[ Drive\Dir: C:\MYDIR\*.* ]========[Pg: 1/ 1][File: 1/ 56]=| |=[ Get File Two ]==[ [V] to View File [PgUp/PgDn: Change Pages]=| | Enter File Two to Compare: ====================== | +================================================================+ * * Disk C: has a volume label of: MY HARD DSK * * You may change to any directory by placing the highlighted cursor on that directory (or drive name) and pressing the [Return] key. The filename you have selected with the cursor appears in the lower box and changes as you move the cursor. If the cursor is on a directory, the message in the lower box states: |=[ Get File Two ]==[ [V] to View File [PgUp/PgDn: Change Pages]=| | To move to this directory press [<-']: A:\ Drive <Dir> | +================================================================+ Pressing [Enter] or [Return] moves to that directory and displays the files in that directory. You may then move the cursor and select a file from this directory or move to another drive/directory. (b) Pre-Viewing Files. If you are not sure what file you wish to compare, I've provided a pre-View option to allow you to look before you leap into the compare. Just put the cursor on the file you wish to pre-View and press [V]iew. (c) Duplicate Filenames. If the same filename is entered for both File 1 and File 2, DoubleTake will alert you and prompt you for a new file 2. g. DoubleTake Navigation Keys. Once you have the filenames selected, use the following techniques to move around and compare various lines between files. File 1 shows at the top of your screen and File 2 shows at the bottom. Notice that long lines text are "wrapped" to succeeding lines. (1) Scroll Methods. There are two methods for scrolling through the files: Parallel Scrolling and Opposite DOUBLETAKE DOCUMENTATION Page 10 Scrolling. You can toggle between these modes at any time while you are viewing the files. The compared lines (at the center of the screen) can be customized to unique colors to make them more easily distinguished from the rest of the lines. See the Customization section for more details. (a) Opposite Scrolling. Here's the way Opposite scrolling works: NOTE: In this mode you may find it a bit disconcerting dealing with the upper window. This file scrolls "backwards," meaning as you go forward in the file, it appears to move in the opposite direction. If you don't like this problem, try the Parallel Scrolling mode. +[Line: 1][ File 1 ]==== This is File 1, line 10. | This is File 1, line 9. | Scrolling /////////////////////// | Forward This is File 1, line 2. | Highlighted ----> This is File 1, line 1. v Col 14 hilighted Lines ----> |=========================== showing mismatch This is File 2, line 1. ^ This is File 2, line 2. | Scrolling /////////////////////// | Forward This is File 2, line 9. | This is File 2, line 10. | +[Line: 1][File 2 ]====== As the files scroll, they scroll into and out of the center. With the compared lines right above each other, it makes it really easy to find differences in the lines. Use the Find Next Mismatch key to locate the next mismatched line, then find out how it differs by one-on-one matching. Notice that graphics displays or boxes will appear in reverse order in the upper window. If this is annoying, press [S] and switch to the Parallel Mode temporarily, or Zoom the file to full screen temporarily. DOUBLETAKE DOCUMENTATION Page 11 (b) Parallel Scrolling: Here's the way Parallel scrolling works: +[Line: 1][ File 1 ]=========== This is File 1, line 2. ^ This is File 1, line 3 | Scrolling //////////////////////// | Forward This is File 1, line 10. | <-- Blank line makes it easier to sight on the Highlighted--> This is File 1, line 1. \two middle lines Lines--> This is File 2, line 1. ^ / being compared This is File 2, line 2. | Scrolling //////////////////////// | Forward This is File 2, line 10. | +[Line: 1][ File 2 ]=========== Notice that the files both scroll in the same direction for Forward and Backward. This may be easier for some users. Notice that the first line of File 1 is at the bottom of the window. The rest of File 1 is in the proper order at the top of the box. This Scrolling method will ensure any boxes or graphics displays in File 1 will appear normally. (2) Key Definitions. The definitions of the function keys are shown at the bottom of the screen. To get the definitions of the other keys, use the Help key [F1] or [?]. Use the numeric keypad (or optionally, the Function keys) to scroll file 1, file 2 or both. If you get lost, just press [F1] or [?] to get a complete key list. NOTE: The keypad keys are all close together for all functions, making the keypad easier to use than the function keys. Both are provided for your convenience. Key Definition [F1] or [?] Help key. Press this key to get a list of all active keys when in the Main Screen as well as in the Configuration Screen. Note: When you press the Help key, a registered User can get the commercial only by pressing the [F1] key. If you have not registered, the commercial will appear when you start or leave DoubleTake, and every time you get Help. DOUBLETAKE DOCUMENTATION Page 12 Key Definition [/] Enable the pop-up menuing system. The commands listed here are all available from the pop-up menu commands (with the obvious exception of the scrolling keys -- it would not be reasonable to use a 2 or 3 key pop-up menu choice to accomplish what the scroll keys do in one keystroke). See the Pop-Up Menu section for a detailed description of this menuing system. [B] Blank Ignore toggle. This toggles whether or not the Find Next Mismatch or Find String routines skip the Ignore Characters selected on each line. This allows easier compare of files which differ only in the spacing between the words in the two files. In the Hex Mode, all characters you choose to ignore will be shipped. Normally, the characters to ignore will be at least the [Blank] and [Tab] characters. The Configuration section to see how to change the characters to Ignore. [C] Configure colors and options. [Alt-D] Exit to DOS. This option allows you to temporarily jump to DOS to do any tasks you would like and then type the word EXIT and return to the exact place you left in DoubleTake. This is much faster than Quitting DoubleTake and having to reload the files from scratch. [D] Display special characters toggle. This toggles between displaying the characters 1-31 and 128-255 or displaying a period for all non-standard characters. This is functional only in Hex Mode. [E] EGA/VGA Mode. This allows you to toggle the EGA/VGA card between the 25 and 43/50 line modes. When you press [E], if you have an EGA or VGA card in your computer, you will be automatically toggled to the 43 (or 50) line mode if you are in the 25-line mode. If you are in the 43 (or 50) line mode, you will be toggled back to the 25 line mode. If you do not have an EGA or VGA adapter, you will here a Bell when you press [E]. NOTE: As expected, this only works on machines which have the EGA or VGA card installed. There is no check to see if there is an EGA/VGA monitor attached, so you need to take care that you do not shift to a mode which is not supported by your monitor. DOUBLETAKE DOCUMENTATION Page 13 Key Definition [F] Find a String or HEX values. This works in either Hex or ASCII mode. If you are in the Two- file mode, you will have the option of choosing which file to search for the string: +[ ASCII Mode ]=========================+ | | | Which file [1][2][B]oth <B> | | | +=======================================+ Press [Enter] for the default value, search [B]oth files. You will then have the options of: +[ ASCII Mode ]=========================+ | | | Ignore Case (Y/N) <Y> | | | +=======================================+ If you choose [Y], then the string will match any combinations of caps or lower case for the whole file. Now enter the string to find: +[ ASCII Mode ]=========================+ | | | Enter String: ===================== | | | +=======================================+ In the ASCII Mode, just type any characters you wish to find, followed by the [Return] key. In the HEX Mode, you have the same options, except you must enter either Hexadecimal values (0 to F) or any string. You MUST enclose the string in either single or double quotations marks, however. This option allows you to search for single or double quotes by enclosing the text with the opposite type of quote marks (i.e., use double quotes to enclose a string containing an apostrophe, single quotes to enclose a string containing double quotes. You may interrupt the search at any time by pressing any key. DOUBLETAKE DOCUMENTATION Page 14 Key Definition [Alt-N] Load a new file or files. Use this to change File 1 or File 2 or both. If you loaded only one file from the command line, use this command to load the second file if needed. Also useful to compare multiple files to the same file. You will have the same options (direct type-in or the File Picker) as when you initially load the files. [O] WordStar(tm) Mode On/Off toggle. This toggles the WordStar mode On/Off. When WordStar(tm) Mode is on, the high bit is stripped from each character. This converts the Horizontal double line box from "=======" into "MMMMMMM" but it is mainly useful to correct the last character of most words in a WordStar(tm) file. DOUBLETAKE DOCUMENTATION Page 15 Key Definition [Alt-P] Toggle PrtSc On/Off. When DoubleTake starts, PrtSc is disabled -- pressing [Shift-PrtSc] will do nothing. This allows you to freely use the [Left-Shift] or [Right-Shift] (instead of the [Ctl] key) with the cursor movement keys to move either file one page at a time. (See the discussion of the [Right-Shift] in the [Z]oom section below.) If you do desire to do a PrtSc, you must first press [Alt-P] to turn PrtSc back on. You can tell the status of PrtSc by the PrtSc indicator in column 71 of the Key Status Line: If this symbol is reverse video (i.e., if the symbol is ON), then PrtSc is enabled or ON. Pressing [Shift-PrtSc] now will send a copy of the page to the printer. When this symbol is normal video (i.e., off), [Shift-PrtSc] does nothing. [Q] Quit. This key will exit DoubleTake and return to DOS. [S] Scroll Mode. This toggles between the Opposite and Parallel scrolling modes. See the description of the two types of scrolling in the previous section. (This key not available in Zoom Mode.) NOTE: In the following description of keys, you will see the terms up/back and down/forward. Think of it as moving the highlighted line up and down the page. Although the highlighted line does not move, think of Up/Back as meaning moving the highlighted line to a previous line on the page and Down/Forward as meaning moving the highlighted line further down the page. [T] This will return both files to Top of File as when you first loaded DoubleTake. [Alt-X] Toggle between the 24-Character and 80-Character Modes. DOUBLETAKE DOCUMENTATION Page 16 Key Definition [X] Hex Mode Toggle. This toggles between the ASCII mode and the Hex modes. When in Hex mode, you will see the Hexadecimal equivalent of the character along with the printed character, similar to the Debug format. See the following for Hex options. DOUBLETAKE DOCUMENTATION Page 17 Key Definition [Z] Zoom feature. This allows you to zoom either file up to full screen. You may wish to use this for a more complete look at one of the files and then return to the dual window mode to continue the compare. When you press [Z] you'll be asked: ╒[ Zoom a File ]========================╕ | Zoom which file? <1/2/None> [N] | ╘=======================================╛ Pressing [<-'] or [N] will default to None. Press [1] to Zoom File 1 and [2] for File 2. When you have a file Zoomed, all keys for either file will work. For example, when you have file 1 Zoomed, the normal movement keys, [Home], [End], [Ctl-Home], [Ctl-End], move around the file, as well as the [PgUp], [PgDn], [Ctl- PgUp], [Ctl-PgDn] keys. This makes it much easier to move around any file, whether in Zoom or Two-File mode. To help differentiate between files, the filenames and line numbers are in the same location as in the dual window mode. NOTE: When you use DoubleTake in the single file mode, you are in the Zoom Mode and the file is considered File 1. If you use DoubleTake often as a single file view utility, you may wish to reconfigure the highlight colors to match the main window colors. (The [Z] key is not available in the Single File Mode.) Here's how file 1 looks in Zoom mode: +[Line: 1][ File 1 ]=========== Hilite -> This is File 1, line 1. ^ This is File 1, line 2 | Scrolling //////////////////////// | This is File 1, line 10. | Forward This is File 1, line 11. | This is File 1, line 12. | This is File 1, line 13. | This is File 1, line 14. | //////////////////////// | This is File 1, line 21. | +================================ (File 2 looks the same, except that the Line Number and Filename are on the bottom.) DOUBLETAKE DOCUMENTATION Page 18 Key Definition [Home] or [F3] Scroll File 1 up/back--to view previous lines in the file. [Ctl-Home] [Ctl-F3] [RShf-Home] Scroll File 1 up/back one window full. [End] or [F5] Scroll File 1 down/forward-to view later lines in the file. [Ctl-End] [Ctl-F5] [RShf-End] Scroll File 1 down/forward one window full. [PgUp] or [F4] Scroll File 2 up/back. [Ctl-PgUp] [Ctl-F4] [RShf-PgUp] Scroll File 2 up/back 9 one window full. [PgDn] or [F6] Scroll File 2 down/forward [Ctl-PgDn] [Ctl-F6] [RShf-PgDn] Scroll File 2 down/forward 9 one window full. [UpArrow] or [F7] Scroll both File 1 and 2 up/back. (This key also works in Zoom or Single File Mode.) [DownArrow] or [F8] Scroll both file 1 and 2 down/forward. (This key also works in Zoom or Single File Mode.) [Gray+] or [F9] Scroll both files up/back 9 lines. (This key also works in Zoom or Single File Mode.) [Gray-] or [F10] Scroll both files down/forward 9 lines. (This key also works in Zoom or Single File Mode.) [Sh-Ctl-Lf] [Sh-Ctl-F9] Hex Mode only. Moves both cursors back in the files. [Sh-Ctl-Rt] [Sh-Ctl-F10] Hex Mode only. Moves both cursors forward in the files. [Ctl-Right] or [Ctl-F10] Hex Mode only. This moves the file 2 cursor to the right one byte at a time. The Byte counter for the file will show the current location in the file. Use this to align the cursors in the two files for the Find Next Mismatch, for example. DOUBLETAKE DOCUMENTATION Page 19 Key Definition [Ctl-Left] or [Ctl-F9] Hex Mode only. This moves the file 2 cursor to the left one byte at a time. The Byte counter for the file will show the current location in the file. Use this to align the cursors in the two files for the Find Next Mismatch, for example. [RightArrow] or [Ctl-F8] In ASCII mode, this pull File 1 up to approximately the same spot as file 2. (This key not available in the Zoom or Single File Mode.) In Hex Mode, this key works for any mode (Zoom, Two-File, etc.) and moves the cursor to the next byte in the file. Use this key to align files after a Find Next Mismatch to prepare for the next Find Next Mismatch. NOTE: You will be asked to confirm Y/N when you press [RightArrow]. [LeftArrow] or [Ctl-F7] In ASCII Mode, this pulls File 2 up to approximately the same spot as file 1. (This key not available in the Zoom or Single File Mode.) In Hex Mode, this key works for any mode (Zoom, Two-File, etc.) and moves the cursor to the next byte in the file. Use this key to align files after a Find Next Mismatch to prepare for the next Find Next Mismatch. Alignment Keys: The [Left Arrow]/[Right Arrow] keys are alignment keys which can be used to restore the files to approximately the same location. If you have been moving forward in only one file, the align keys will allow you to bring the other file up quickly without having to manually walk it forward. NOTE: You will be asked to confirm Y/N when you press [LeftArrow]. NOTE: These alignment keys only work forward. If you try to pull a file back to a previous location, you will get warning tone. If you need to go back, simply use the Top of File key and start over. In Hex Mode, this key works for any mode (Zoom, Two-File, etc.) and moves the cursor to the next byte in the file. Use this key to align files after a Find Next Mismatch to prepare for the next Find Next Mismatch. DOUBLETAKE DOCUMENTATION Page 20 (3) Pop-Up Menuing System. If you prefer a menu system instead of the keystroke shortcuts, press the [/] key to bring up the following prompt at the bottom of the screen: [F]ile [D]isplay [C]onfigure [S]earch [H]elp Notice the [F] is highlighted. If you simply press [Enter] the File Menu will pop-up. You may also press [D] to get the Display menu, [C] to go directly to the configuration function, [S] to get the Search menu or [H] to go directly to the help screen. This feature allows you to go to directly to Configure or Help with a single keystroke, or directly to the pop-up menu of choice without scrolling left or right. You also can scroll left or right to other pop-up windows by pressing the [Left Arrow]/[Right Arrow] keys. (a) [F]ile Pop-Up Menu. Pressing [F] or scrolling left or right to the [F]ile selection reveals the following pop-up window: +-[ File ]----------------------+ | | | [T]op of file [T] | | [N]ew file [Alt-N] | | Shell to [D]OS [Alt-D] | | [P]rint Screen On/Off [Alt-P] | | [Q]uit DoubleTake [Q] | | | +-------------------------------+ [F]ile [D]isplay [C]onfigure [S]earch [H]elp The left column shows the command with the single letter needed to invoke the command from this pop-up menu. The right column shows the short-cut key to use while viewing/comparing files in DoubleTake. For example, at this pop-up menu, press [N] to load a new file. While in DoubleTake, simply pressing [Alt-N] will go directly to the new file function. DOUBLETAKE DOCUMENTATION Page 21 (b) [D]isplay Pop-Up Menu. Pressing [D] or scrolling right or left to the [D]isplay selection reveals the following pop-up window: +-[ Display ]-----------------------+ | | | Ignore [B]lanks [B] | | [Z]oom File [Z] | | [D]isplay Special Chars [D] | | W[o]rdStar Mode [O] | | [S]croll Mode Toggle [S] | | [E]GA/VGA mode Toggle [E] | | Mode (He[x]/ASCII) Toggle [X] | | [ ASCII Align [1] with 2 [<] ] | | [ ASCII Align [2] with 1 [>] ] | | Hex [W]idth (24/80) [Alt-X] | | | +-----------------------------------+ [F]ile [D]isplay [C]onfigure [S]earch [H]elp Note the square brackets in the above pop-up menu. These brackets surround options which are not possible in the current display mode. For example, when you are in ASCII Mode, you may not Display Special Characters -- only in Hex Mode. If you choose one of the bracketed options, you will hear a beep signifying the option is not available. (c) [C]onfigure Pop-Up Menu. When you scroll left or right to reach this menu, you will see the following pop-up window: +-[ Configure ]------------+ | Press [<-'] to Configure | +--------------------------+ [F]ile [D]isplay [C]onfigure [S]earch [H]elp Press [Enter] to go to the Configuration Menu or press the [Left Arrow]/[Right Arrow] keys to scroll to another pop-up menu. DOUBLETAKE DOCUMENTATION Page 22 (d) [S]earch Pop-Up Menu. This selection shows the following choices: +-[ Search ]-------------------+ | | | Find next [M]ismatch [*] | | [F]ind String [F] | | Find string [A]gain [Alt-F] | | | +------------------------------+ [F]ile [D]isplay [C]onfigure [S]earch [H]elp Notice, you must press [M] from this pop-up menu to Find Next Mismatch, but you may press the grey [*] while viewing/comparing files in DoubleTake to Find Next Mismatch. (e) [H]elp Pop-Up Menu. When you scroll left or right to reach this menu, you will see the following pop-up window: +-[ Help ]-------------+ | Press [<-'] for Help | +----------------------+ [F]ile [D]isplay [C]onfigure [S]earch [H]elp Press [Enter] to go to the Help or press the [Left Arrow]/[Right Arrow] keys to scroll to another pop-up menu. 4. DoubleTake Configuration Made Easy DoubleTake offers you several customize options to tailor it to your personal preferences. The following are changeable: o Main and Help Window Foreground and Background colors. o Highlighted line Foreground and Background colors. o WordStar(tm) mode (whether the high bit is stripped). o Highlight method and colors (normal, flashing or reverse) o Type of Monitor card (Slow CGA card (IBM) or Fast card (almost every other CGA card made)). o Method of Text Scrolling (Parallel or Reverse). o Method of display (Hex or ASCII) o Width of Hex Display Mode (24 or 80 column mode) o Show ASCII chars 1-31,128-255 or show them as periods. o Ignore or recognize blanks in a compared line. a. Configuration Modifications. There are two ways to make changes to DoubleTake's configuration file DUBLTAKE.CNF: 1) Invoke DoubleTake with any file(s) and press [C] to enter the configuration mode and the [W]rite the new values to disk or DOUBLETAKE DOCUMENTATION Page 23 2) change the file DUBLTAKE.CNF with an ASCII editor (such as DOS's EDLIN.COM, or Sammy Mitchell's outstanding Quick Editor-- QEdit, for example.) Here's the way the default DUBLTAKE.CNF looks: 7 Main Screen foreground color (0-15) 0 Main Screen background color (0-7) 0 Help Screen foreground color (0 to 15) 7 Help Screen background color (0 to 7) 0 HiLi Screen foreground color (0 to 31) 7 HiLi Screen background color (0 to 7) False Non-WordStar(tm) Mode (T/F) (all, even graphics chars) ASCII Ascii Mode to display files (ASCII/Hex) 80 Characters to Display in Hex Mode (24 or 80) True Ignore blanks (T/F). Ignore Characters on next line. 09 0A 0C 0D 20 True Display Control Chars/High Graphics chars (Hex mode) (T/F) Fast Fast Video Mode Selected (Slow/Fast) R Reversed Mismatch line Selected (Flashing/Reverse/Normal) O Opposite Scrolling Mode Selected (Parallel/Opposite) False Do not Sound the Bell at all (T/F) NOTE: The Ignore Characters line (line 11 above) consists of hexadecimal values separated by a space. Except for this line, all lines consists of two parts: 1) the value in the first column, and 2) the explanation in the second column. All legal values for column 1 are shown at the end of the explanation line in column 2. If you use other than a legal value, DoubleTake will skip that value and keep its default value. Ensure that you keep the spacing on each line identical to the original. Do not rearrange the lines or insert blank lines into the file. If you do, the file will not load correctly and the default values will be loaded. Error Recovery. Take heart! Even if you completely wreck the configuration file, you can create a new one by following these steps: 1. Run DT (alone or with a file) 2. Choose [F10] Configure from the files menu (if DT was run alone) or choose [C]onfiguration from the main screen, then 3. Change the values to reflect your preferences, and 4. [W]rite out a new copy of DUBLTAKE.CNF. b. Choosing Your Favorite Colors DoubleTake comes in plain vanilla White on Black (with the help screen in exciting Black on White!!). This means it DOUBLETAKE DOCUMENTATION Page 24 should be readable on any screen, whether it's a monochrome, color or monochrome monitor on a color card. NOTE: If you are using a monochrome video display on a Color Graphics Adapter, and the display is horrible, you might be able to improve it by exiting DoubleTake and, using the MODE.COM program from you DOS disk, typing: A:\>MODE BW80[<-'] ([<-'] is the [Return] or [Enter] key.) Now re-run DoubleTake for a much more readable display because DoubleTake checks to see what type of video mode in effect. c. Configuring DoubleTake Options If you would like to add a bit more pizazz to the program, press [C] to invoke the Configuration option. You will see the following screen: +========[ DoubleTake ]========+ | Configuration Function | +==============================+ +[ Main Screen ]==============+ +[ Help Screen ]==============+ | [>] to move to Help window | | [<] to move to Main window | +=============================+ +=============================+ +[ Instructions ]============================[ F1 for Help ]+ | | | Change text colors: [F]oreground [B]ackground | | Change HiLi colors: [Ctl][F]orgnd [Ctl][B]ckgnd | | | | Vid Lines (25 - 43/50)[E]GA/VGA only: 25 | | WordStar(tm) (strip Hi bits) Mode: [O]ff | | [H]ighlight Mode: Normal | | Toggle [V]ideo Mode: Fast | | Toggle [S]crolling Mode: Opposite | | Toggle [A]scii/Hex Mode: ASCII | | Toggle 24/80-[C]har Hex Display Mode: 24-Character | | [F10-Edit] Set Ignore b[L]anks Mode: Ignore | | Ignore:[09 0D 0A 20 ] | | Toggle show s[P]ecial chars: Show chars | | Toggle [N]oisy beep: Bell Sounds | | [W]rite Configuration file [Esc] Exit, No Save | | | +===========================================================+ DOUBLETAKE DOCUMENTATION Page 25 d. Configuration Mode Key Definitions. The following keys are active while in the Configuration Option: Key Definition [F1] or [?] Get Configuration Help. This provides help about the Configuration Options and the Exit Options. [RightArrow] If the Main Window is highlighted, this key moves to the Help Window to allow changing the colors for that window. [LeftArrow] If the Help Window is highlighted, this key moves to the Main Window to allow changing the colors for that window. [F] Move to the next color for the foreground. The colors allowed for the foreground are: 0 Black 8 LightGray 1 Blue 9 LightBlue 2 Green 10 LightGreen 3 Cyan 11 LightCyan 4 Red 12 LightRed 5 Magenta 13 LightMagenta 6 Brown 14 Yellow 7 White 15 LightWhite [B] Move to the next color for the background. The colors allowed for the background are: 0 Black 1 Blue 2 Green 3 Cyan 4 Red 5 Magenta 6 Brown 7 White [Ctl-F] Change the foreground of the highlight color for the compared lines in the center of the screen. See [F] for the foreground colors. [Ctl-B] Change the background of the highlight color for the compared lines in the center of the screen. See [B] for the background colors. DOUBLETAKE DOCUMENTATION Page 26 Key Definition [E] Toggle between 25 and 43/50 line mode on cards that can shift (EGA or VGA). [O] Change the WordStar(tm) Mode. This key toggles the WordStar(tm) mode On or Off. When the WordStar(tm) mode is On, all characters will have their high bits stripped off before they are displayed on the screen. This mode allows you to read files which contain characters with their high bits set. If that is a bit of Greek, then here's a quick explanation. When you create a file with WordStar(tm) in the Document mode, WordStar(tm) uses the last character in each word to control microspacing for justifying the text. It does this by setting the high bit. When you display this word on the IBM monitor, you will see the last character as a strange symbol, a greek letter or a graphics character. If you toggle the WordStar(tm) mode On, this character will once again appear as a normal character. [H] Change The Highlight Mode For Mismatched Lines. When you press [H], in the Main Screen window, the highlight mode cycles between Flashing, Reversed and Normal. Use this key, in conjunction with [Ctrl-F] and [Ctrl-B] keys, to get the desired effect on the highlighted lines. [C] Toggle between the 24 and 80 Character Hex Display Modes. [V] Speeding Up The Display On A Fast Color Graphics Adapter. On many clones, the color card is much faster than the IBM CGA. Because of this you do not need to wait for retrace to write to VIDEO memory. To take advantage of your card's faster speed, use the [V]ideo mode key to toggle to the Fast Video mode. If you see snow when in the Fast mode, you'll need to toggle back to Slow if this snow annoys you. [S] Toggle Scrolling Mode. Press the [S] key to toggle between the Parallel and Opposite Scrolling Modes. This option can also be toggled at any point while viewing files and in the Configuration screen. DOUBLETAKE DOCUMENTATION Page 27 Key Definition [X] Toggle between Hex and ASCII. Some files, such as binary files like COM and EXE files, are difficult/impossible to display in DoubleTake in the ASCII mode. If you wish to compare two binary files, toggle into the Hex Mode using the [X] key. (When you initially run DoubleTake, it checks for the presence of non-printing characters and shifts to the Hex mode automatically if it detects them.) [L] Toggle Ignore Blanks. When you're comparing two source files, you are interested in the actual differences between the two files, independent of the spacing. Press [B] to toggle Ignore Blanks On to disregard all spaces included on each line. [F10] Edit or add to the Ignore characters. DoubleTake comes configured to ignore Blanks, Tabs, Carriage Returns, Line Feeds and Form Feeds. You will be allowed to enter new values, but enter them all in Hexadecimal. Some common values are shown along with a full ASCII chart for reference while entering values. Use [PgUp] or [PgDn] to move to other pages of the ASCII Chart. [P] Toggle Display of Special characters. In Hex Mode, you may or may not wish to see the actual value of the character as printed. You may opt for a less cluttered display by choosing the Display as periods option. This displays the characters 1-31 and 128-255 as periods. Toggle again to get the characters back. [W] Write configuration to Disk. Use this key to save a copy of your choices in the file DublTake.CNF. When DoubleTake starts again, it will load and set these defaults. After writing to disk, you will be returned to DoubleTake for more file comparison. [Esc] This exits the configuration option with the current settings, back to DoubleTake. If this is a temporary change (such as color settings) you may not want to permanently change the defaults. 5. DoubleTake Limitations. a. Duplicate Filenames: I've tried to check for duplicate filenames entered. If you have the same file open twice, you may DOUBLETAKE DOCUMENTATION Page 28 get garbage in one of the windows, especially if you get one window ahead of the other. You CAN fool DoubleTake and enter the same filename twice, but why would you want to??!! b. Truncated Lines: DoubleTake will truncate any lines longer than 255 characters in the ASCII mode--I hope that is not a big problem. If so, use the HEX mode to see ALL of the characters. In the Hex 80-character wide mode, you can compare two ASCII files quite easily. Use the [D]isplay special characters toggle to turn off the strange-looking characters if it troubles you. c. File Load Limits in ASCII Mode. DoubleTake can read any size file because it pulls in 300 lines at a time. When it gets close to the end of the buffer, it loads another 150. Because of this, after you load more lines in ASCII mode, you cannot scroll back more than about 150 lines. If you need to see the beginning of the file, just press [T]op-Of-File to go to the beginning of both files. NOTE: In HEX mode both files are fully scrollable in both directions! 6. Included Files (Plus Tutorial). The following files are included with DoubleTake: DT.EXE DoubleTake executable file, main program DUBLTAKE.CNF Sample Configuration File. You may create a completely new file to your tastes when you first run DoubleTake. DUBLTAKE.HLP The help file for DoubleTake. This is a separate file to keep the size of DT.EXE small. DUBLTAKE.ASC ASCII Chart loaded while entering Ignore characters DUBLTAKE.HST The history of the revisions to DoubleTake, including GoodLook's evolutionary history. HIST.BAT Batch file to read DUBLTAKE.HST with DoubleTake. READ.ME A short introductory file describing DoubleTake. README.BAT Batch file to read DT-READ.ME with DoubleTake. DUBLTAKE.DOC The complete documentation for DoubleTake. READDOC.BAT Batch file to read DUBLTAKE.DOC with DoubleTake. TUTOR.BAT A batch file running DT which loads the following files to demonstrate DoubleTake. 2INDENT.FIL \__Demo files for practice using DoubleTake's 4INDENT.FIL / numerous features. See below. Demonstration Files for Tutorial and Practice. Two files are included to demonstrate the features of DoubleTake while allowing you to practice with the various keys. The files are extracts from the introduction of DoubleTake Documentation, with random x's distributed throughout both files to have some differences to find. Additionally, file 2Indent.Fil has two indented spaces while 4Indent.Fil has four indented spaces and other differences DOUBLETAKE DOCUMENTATION Page 29 in spacing to allow you to demonstrate the Blank Ignore features. Helpful comments are included in the files to prompt you as you find mismatches. For best results load "2Indent.Fil" as File 1 and "4Indent.Fil" File 2 as shown following. (If you simply run the batch file TUTOR.BAT, it's automatic!) C:\UTILS\DT 2INDENT.FIL 4INDENT.FIL[<-'] 7. Shareware and Registration. This software is not free. It is marketed under the try-before-you-buy concept to allow you a complete test of the product before you are required to register. Although the unregistered version shows the commercial when you begin and end DoubleTake (and every time you ask for help), it is not crippled in any way -- in fact the addition of the Hex mode and Find String features are major enhancements! *** Only $20! *** If you like DoubleTake and continue to use it after the 30-day trial period, please register by sending $20.00 to: John L. Dove III 7640 Provincial Drive #309 McLean, VA 22102-7611 I'll then send you a registered version and a printed copy of the manual, which is also furnished on disk as DublTake.DOC. If you have any questions, comments or suggestions for improvement, please send them to me at that address. Thank You! John Dove May 15, 1991.