Hot on the heels of the recent launch, we"ve got some fun things to do with Google Talk! There are some secret parameters that allow you to change the way the program runs. The most important I think it is /nomutex, which allows to open more than one instance; You can either sing in twice with the same user.
These are the others:
/forcestart, /autostart, /register, /checkupdate, /nogaiaauth, /plaintextauth, /factoryreset, /gaiaserver, /mailto, /create_sesion.