Hi,
Which one are you using? Backtrack 5 as mentioned in your first post or BackTrack 3 which you refer to in your last one? If you're only looking on how to start/stop wireless then browse to the menus, there should be a wicd mentioned in there. If I'm not mistaking that's the default utility in BackTrack to start/stop/configure your wireless. Or you could start/stop in a terminal with
Code:
wicd start
wicd stop
Kind regards,
Eric