How to use use multiple Google Talk ?

STEPS 

1) Right click on the Google Talk shortcut.

2) Click on Properties.

3) Go to Shortcut tab on Google Talk properties window.

4) On the Target textbox, add in the /nomutex to the end of the line so that it looks like below (or you can simply copy and paste the below syntax and replace the original).

      “c:\program files\google\googletalk\googletalk.exe” /nomutex

5) Click on OK.