XPdosMsg()
   Return information about a DOS error code
------------------------------------------------------------------------------

  Function:    XPdosMsg()

               This function will return a 1 line explanation
               about the supplied DOS error code. Written in
               Assembly using a table lookup, this function is
               small and efficient (and anyway, the code is overlaid,
               is it not? (when using Blinker)), and handy in
               the world of DOS error codes, where you and I
               know that 4 means "No More handles", but did
               you know by heart that 32 indicates "File
               Sharing Violation"?

               This function can be Useful to add to your
               ErrorSys. Note that the messages are returned
               in English, maybe some day there will be
               different version for different languages..

 Syntax:      XPdosMsg(nDOScode) --> cErrMessage

 Arguments:   nDOScode is the DOS code, as returned by [XP]ferror(),
              DOSerror(), your ErrorSys or whatever.

 Returns:     A line explaining the Error, well Explaining. It's the
              name of the error.


        Currently, the following Codes are supported (in Hex):

Code  Meaning                           Code  Meaning
 00h  No error                           22h  Invalid disk change
 01h  Invalid function number            23h  FCB unavailable
 02h  File not found                     24h  Sharing buffer overflow
 03h  Path not found                     32h  Network request not supported
 04h  No handle available                33h  Remote computer not listening
 05h  Access denied                      34h  Duplicate name on network
 06h  Invalid handle                     35h  Network name not found
 07h  Memory control blocks destroyed    36h  Network busy
 08h  Insufficient memory                37h  Network device no longer exists
 09h  Invalid memory block address       38h  Net BIOS command limit exceeded
 0Ah  Invalid environment                39h  Network adapter hardware error
 0Bh  Invalid format                     3Ah  Incorrect response from network
 0Ch  Invalid access code                3Bh  Unexpected network error
 0Dh  Invalid data                       3Ch  Incompatible remote adapter
 0Eh  Reserved                           3Dh  Print queue full
 0Fh  Invalid drive specification        3Eh  Not enough space for print file
 10h  Attempt to remove the current      3Fh  Print file was deleted
      directory                          40h  Network name was deleted
 11h  Not same device                    41h  Access denied
 12h  No more files                      42h  Network device type incorrect
 13h  Disk write-protected               43h  Network name not found
 14h  Unknown unit                       44h  Network name limit exceeded
 15h  Drive not ready                    45h  Net BIOS session limit exceeded
 16h  Unknown command                    46h  Temporarily paused
 17h  Disk data error (CRC)              47h  Network request not accepted
 18h  Bad request structure length       48h  Print or disk redirection paused
 19h  Seek error                         50h  File exists
 1Ah  Unknown media type                 51h  Reserved
 1Bh  Sector not found                   52h  Cannot make directory entry
 1Ch  Printer out of paper               53h  Critical-error interrupt failure
 1Dh  Write fault                        54h  Too many redirections
 1Eh  Read fault                         55h  Duplicate redirection
 1Fh  General failure                    56h  Invalid password
 20h  File sharing violation             57h  Invalid parameter
 21h  File locking violation             58h  Network device fault