Be default we can only login into one Google talk account and chat with select group of people. Do you want to login into multiple Google Talk accounts and chat with different set of Google Talk buddies? If yes, login intocmultiple Gtalk simultaneously by following methods.
1. Quick manual method for multiple Gtalk
1. Click Start > Run and type C:Program FilesGoogleGoogle Talk Alternatively, you can browse to open Google Talk folder from MyComputer > C drive:
2. Right click on Google Talk icon and then click Send To > Desktop (create shortcut). A new shortcut to open Google Talk will be created on the desktop.
3. Right click on that newly create Google Talk icon on the desktop and click properties. You need to modify Target field in the Google Talk properties window.
Original – “C:Program FilesGoogleGoogle Talkgoogletalk.exe”
Change  -  ”C:Program FilesGoogleGoogle Talkgoogletalk.exe” /nomutex
4. Click Apply, OK and start using multiple Gtalk application.
2. Install Google talk Labs Edition
If above is too much task, then you can simply download and install Google Talk Labs edition software. It has number of enhanced features like multiple gtalk, group chat, emoticons and many more.