I'm a new, first-time user. This is a basic question that demands an answer. Can I use Limewire from behind a "corporate" type firewall?

I just installed Limewire and was all excited -- until I tried my first search. The "search" tab remains shadowed at all times, no matter what I try. Will one of you gurus please let me in on the secret? FYI, I have a T1 connection. Thanks.