I had read that the Atomic Edition let you play multiplayer against bots, but I see no way to do this. The only way to play multiplayer is to select "Play on TEN", but it tells me I must be playing on Windows 95.
Anyone know if there is in fact bots and how to access them?
Thanks!

There are bots, but they only work offline, if that's what you want. They also have inhumanly accurate aim >_<
You can only get at them by using command-line switches. Easiest way is to edit dosboxDuke3D.conf in the game directory.
At the very bottom of the file, you find this:
[autoexec]
# Lines in this section will be run at startup.
@ECHO OFF
mount C "."
c:
cls
duke3d.exe
exit

Change the line that says duke3d.exe to duke3d.exe /a /q# /v# /l# /m replacing the # with an actual number: q is the number of bots (up to 7) v is the episode number, l is the level number. If you want to include monsters, leave off the /m.

Thank you very much for the info!!!