MadHadder is right...it depends a LOT on the card/connection manager. apple iBook? i have no friggin clue. if you are using Windows XP's built in manager, I am pretty sure you are S.O.L. (although, nowing M$ it is stored plaintext somewhere in the registry or a file.) Win9x/Me/2K depends on the client software...let us know what you have and I will see what I can figure out.
