well, without knowing the particulars
(if your going to request help, pls
include machine model & OS in question),
its hard to say but the bottom line
is that under OSX, you need to use
the opensource drivers on
wirelessdriver.sourceforge.net
and then configure it. The Airport driver
ain't gonna work.
I have and use Wavelan cards on a Lombard
and TiPB4 and they work fine.