If you have two or more Google Accounts and if you want get all the accounts be available for chat, you can depend upon this trick
- First locate the shortcut for GTalk in Desktop or Start Menu
- Go to Properties
- Under Shortcut tab, you will see a text input box named Target
- Replace the path in it with the following one
“%ProgramFiles%\Google\Google Talk\googletalk.exe” /nomutex
- Press OK
- When your working with a GTalk Account, you can open this shortcut and it will open a new window without closing the exixting one!