Ever since I moved my mails from Gmail to Google Apps, I was using my Google Apps email address in Google Talk. But still some of my old friends are added in my Gmail address. So I was searching for a way to run multiple instance of Google Talk in the same machine and found this tip. I thought of noting it here so that I know where to search if I reinstall Google Talk in my system.
To run multiple instances, all you need to do is to pass the parameter nomutex to the Google Talk Exe file.
c:\program files\google\google talk\googletalk.exe" /nomutex
If you want, you can create a new shortcut in your desktop with this parameter.