You should search the UA forum, or wait for a UA lurker to post here, but here is something to start:
http://www.flyertalk.com/forum/showthread.php?t=437021
It talks about the special UGS check-in "room" at LAX! I guess this is kind of like a hotel check-in where status members can get their own little office to check-in, with places to sit and rest, etc.