The
Unreal Tech page has a bit of info about
DirectX7 support and Unreal Tournament. Also while on the topic of Unreal, here is word
from the PU guys via Mark Rein on the cross-gaming use of Unreal and UT maps:
UT will run most Unreal DM maps but probably not run single player maps.
For multiplayer UT can serve most Unreal DM maps (provided you have the texture sets etc.)
with any problems but only UT users can play on a UT server even if it's playing an Unreal
map. I.e. you can't connect to a UT server with Unreal or an Unreal server with UT.