Ok! Here's something cool now. Suppose you have 2 gmail ids and you want to log into both the accounts using GTalk, how will you do??? You can't open multiple Gtalks in your computer. Clicking once on the icon will open Gtalk once. You login. And clicking again on GTalk icon brings you back to the logged Gtalk!
But not anymore! Here is a cool trick that allows you to login different Gtalks simultaneously.
Right click on the Gtalk Shorcut icon on your desktop (If you don't have shortcut icon, create one). Then in the Target function of the shorcut Tab, you'll find something like this in quotes.
"C:\Program Files\Google\Google Talk\googletalk.exe"
Now append '/nomutex' to this without quotes. That is, make it
"C:\Program Files\Google\Google Talk\googletalk.exe" /nomutex
And save it by clicking OK. Now you're done! :)
Now open Gtalk login window as many times as you want just by clicking this shortcut icon and login with as many accounts as you want.