For Q3A, just go into multiplayer and start your server If your brother has your IP address, he can join you. (I find the easiest way is to just make a new entry in Game Spy and double-click it, although you can manually enter it, too.) I've never had my server show up in the server list, btw, but if you have problems, you can stick a password lock on it.
Not sure about UT...
AXIA T-Bird 1GHz @ 1.266GHz
Pentium IV 2.4C Northwood- M0 stepping @ 3.2GHz HT
Air Cooled w/ SP-94 heatpipe & 92mm Vantex Tornado at 45C
4x256=1gb dual-channel 2-3-3-6 OCZ PC800DRAM @ 890MHz 3-4-4-8
MSI Neo2-PLS w/I865PE & SATA @ 4x267=1068MHz
BFG GeForceFX 5900@485/967MHz = 6284 3DMark2003s; dual-head 21" CRT & 19" LCD