One can login simultaneously to more than one account. Unlike yahoo multiple login no need of registry editing here.
Follow these simple steps………
* Create a shortcut of your Google talk.
* Right click the shortcut —-> choose Properties.
* In the “Target” you will find this “C:\Program Files\Google\Google Talk\googletalk.exe”
* Now at the end of target add this “/nomutex” without the quotes. It should be like this “C:\Program Files\Google\Google Talk\googletalk.exe” /nomutex There is a space after googletalk.exe”
Thats it .Click OK and you can open more than one Google talk.