I had this setup, and working, before the last patch:
one CRT running 1600x1200 running as primary
one TFT running 1280x1024 running as secondary. (edited, thx crisalys :P)
I ran AO as _windowed_ 1600x1200 in the primary, and could browse the web, msn, manage winamp and everything else on the secondary, while AO window was still visible on the primary, i.e not minimizing or anything.
Can anyone tell me if this will work on again in 16.3?