Are you using several Google Accounts? DO you have many google talk logins? Do want to manage all your google accounts login on single google talk? If your answers are yes and you want to run multiple instances of google talk at once then follow the below listed procedure:
Run google talk with the following switch: /nomutex

If you installed google talk to the default location, you can easily create a shortcut to this setting.
1. Right-click on the desktop
2. Select New.
3. Select Shortcut.
4. Paste this into the text box:

"c:\program files\google\google talk\googletalk.exe" /nomutex

5. Click Next
6. Name it whatever: Google Talk Multiple, etc.
7. Click OK until you are done.

Feel free to bother me in case you have any confusions or issues with the Google Talk Logins. The common issues will be the typo errros in typing the correct name and “” .