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TWILIGHT.DOC
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1996-05-25
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T W I L I G H T S E N T I N E L
v 2.1
Copyright 1994 Vincent Penquerc'h
All Rights Reserved
DISCLAIMER OF WARRANTY
THE AUTHOR WILL REFER TO VINCENT PENQUERC'H.
THE PROGRAM WILL REFER TO TWILIGHT SENTINEL, INCLUDING THE PROGRAM ITSELF,
ITS DOCUMENTATION, AND ANY FILE IN THE ORIGINAL TWILIGHT SENTINEL PACKAGE.
THE AUTHOR HEREBY DISCLAIMS ALL WARRANTIES RELATING TO THIS PROGRAM,
WHENEVER EXPRESSED OR IMPLIED, INCLUDING WITHOUT ANY LIMITATION ANY
IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
THE AUTHOR WILL NOT BE LIABLE FOR ANY SPECIAL, INCIDENTAL, CONSEQUENTIAL,
INDIRECT OR SIMILAR DAMAGES DUE TO LOSS OF DATA, DAMAGE OF HARDWARE OR
ANY OTHER REASON, EVEN IF THE AUTHOR WAS ADVISED OF THE POSSIBILITY OF
SUCH LOSS OR DAMAGE.
THIS PROGRAM AND DOCUMENTATION ARE RELEASED "AS IS" AS SHAREWARE. IT IS
COPYRIGHTED BY THE AUTHOR, AND ALL RIGHTS AND OWNERSHIP ARE KEPT WITH THE
AUTHOR. YOU MAY USE IT, COPY IT, AND GIVE IT TO ANYBODY AS LONG AS NO
MODIFICATIONS ARE MADE.
PROGRAM AND DOCUMENTATION COPYRIGHT 1994 VINCENT 'INDY' PENQUERC'H, ALL
RIGHTS RESERVED.
ALL QUOTED PRODUCT AND COMPANY NAMES ARE TRADEMARKS OF THEIR RESPECTIVE
OWNERS.
TABLE OF CONTENTS
1. What is Twilight Sentinel ?
2. System requirements
3. Using Twilight Sentinel
4. Command line options
5. Contacting the author
6. Revision history
1. What is Twilight Sentinel ?
---------------------------
Twilight Sentinel is a screen saver. When you have been idle for a
certain time ( that is no keyboard key was hit during this time ),
Twilight Sentinel blackens your screen. At the first key hit, the
screen will be restored and Twilight Sentinel will go on checking for
another idle period. Saving your screen is very important when you stay
idle for a long time, as the screen is likely to get damaged when a
motionless image stays on it.
Twilight Sentinel can be called by programs using its API. Any program
may request Twilight Sentinel to blank or restore the screen.
Twilight Sentinel has a password option that will require a password
to be typed to restore the screen. All keystrokes will be discarded
until the right password is typed.
2. System requirements
-------------------
To use Twilight Sentinel, you will need a 8088 based PC, DOS 2.0 or
higher, and at least 600 bytes of memory. You will also need a VGA
or VGA compatible board.
3. Using Twilight Sentinel
-----------------------
Type TWILIGHT at the DOS prompt. It will start and install itself in
memory. Twilight Sentinel will activate each time you are idle for
the wanted time.
4. Command line options
--------------------
Twilight Sentinel is not case sensitive. Command line options can be
entered in both upper and lower case, even mixing them.
To get an help screen, just type the following:
TWILIGHT -H
or
TWILIGHT -?
To unload Twilight Sentinel from memory, use the 'U' switch:
TWILIGHT -U
To select the idle delay to activate the screen saver, use the 'D'
switch, followed by the delay you want to set, in seconds. For example,
the command:
TWILIGHT -D180
will set a delay of 180 seconds (3 minutes).
If you want to activate Twilight Sentinel without having to wait the
required amount of time, you may press the activation hotkey. The default
is Alt-T, but you can specify a new hotkey at Twilight Sentinel's command
line, using the 'K' switch, as follows:
TWILIGHT -K CONTROL RIGHTSHIFT F1
This is the template for using this switch. You first give the mask
for the hotkey you want, after the letter 'K'. This mask can be any
combination of the following key names: control, alt, leftshift,
rightshift. You may specify any of them in any order, even none of
them. But beware not being in conflict with another program that
would use the same key combination. If you choose a null mask, that is
if you don't give any of these four symbols, Twilight Sentinel will
trigger any time you press this key, so it is likely to trigger even
when you don't want it, if you are to use this key for another purpose.
Giving one or more mask keys is wise. Once the mask is specified, give
the key you want to trigger Twilight Sentinel. You may give any of the
keyboard keys but the special keys, as the shifts, the scroll lock and
num lock keys, the system request key, the break key, the caps lock
key, the control key or the alt key. If the key you choose does not
have an associated character to be displayed, such as the page up key,
or the escape key, use the following table that gives you the word to
use to designate this key:
Function keys: F1, F2, F3, F4, F5, F6, F7, F8,
F9, F10, F11, F12
Arrow keys: up, down, left, right
Keypad special keys: Keypad/, Keypad*, Keypad-, Keypad+,
Keypad5
Other Keys: backspace, del, end, enter, esc, home,
ins, pgdn, pgup, prtsc, spacebar, tab
Know that some key combinations won't trigger Twilight Sentinel's
keyboard handler, as no scan code is sent from the keyboard, especially
when all status keys are pressed at the same time. Command line case is
not significant. You may enter these symbols in upper or lower case,
Twilight Sentinel will accept both.
To enable password, use the P switch, as follows:
TWILIGHT -P
You will be prompted for a password. You may then type your password,
and press enter to accept or escape to abort. If you choose to enable
the password, typing it will be the only way to get back to your screen
once it is blanked. This is great for locking the machine while going
away if the machine is working meanwhile.
The password length is limited to 10 keystrokes.
In the evaluation version, the password can't be chosen, and is always
set to the default string 'register' (without the quotes). You may
by registering obtain a key that will enable Twilight Sentinel to
prompt for a password. See included file ORDER.FRM for details.
To disable software blanking and restoring, you may use the 'N' switch:
TWILIGHT -N
This will prevent other programs from blanking and restoring the screen
by requesting Twilight Sentinel.
To tell Twilight Sentinel to check for mouse activity, use the 'M'
switch, followed by one of those parameters:
0: Dont't check mouse
1: Check mouse not using mouse driver (default)
2: Check mouse using mouse driver
This allows you to use Twilight Sentinel even with bare configurations
with no mouse driver installed and is much faster than checking the
mouse driver.
For example, if you want to use your mouse theu its driver, use:
TWILIGHT -M2
When you have registered, a personal registration number is sent to
you and can be used to register your copy of Twilight Sentinel, so
you can choose the screen restoring password. To register your copy
of Twilight Sentinel, use the 'R' switch, as follows:
TWILIGHT -R <name>,<number>
Twilight Sentinel will then record your registration and no more set
the default password.
5. Contacting the author
---------------------
If you have any bu