OS2/3DS
> When ever I alt-esc out of 3DS I have determined that 3ds "STOPS".
You can find out quickly if this is a video problem. Instead of ALT-ESC out of
3DS, try ALT-HOME. If OS/2 says it doesn't support the video in a window, then
you'll know why it doesn't run in a background.
I've found that the "good" resolutions for 3DS aren't compatible with the
desktop, so when I want to do background rendering, I run a slave session of
3DS. The other solution is to get a video card that has dual-video chips (like
an 8514-Ultra).
— Doug Azzarito