> Let's see. MS-DOS 3.2, 3.3, 4.0, 5.0, 6.0, 6.2, 6.21, 6.22 and 7.0 Beta.

  All of the above, except for 7.0 Beta, as well as 4.01, 3.31, and 2.1

> Novell DR-DOS 5.0, 6.0, 7.0.

  None of the above

> OS/2 Warp 3.0 MDOS.

  OS/2 2.10, 2.11 and Warp.  (I refuse to call it 3.0, since it reports 2.30
as a version number).

> Why, how many versions have you tried running?

  I was just curious.  I'm pretty sure that even with the number of versions
that I've run (and I see now that you've run even more), that there were a
few versions of MS-DOS which didn't report the exact same error messages all
of the time.  The output on various commands changes from time to time.
A perfect example is the DIR command from 6.0 and 6.20.  MicroSoft added
commas to the display.  If you rely on DOS's DIR command for file size or
date information, your program will most likely no longer work under 6.20.

                            /\/ Richard Glidden \/\

                        --- * The Imperial Sanctum * ---
                         ---[VSB] [ASV] [DM/F!] [G3]---