This is very simple and very cool and useful.Here is how you can do.All you need is to add /nomutex at the end of the target of ur google talk shortcut.
Suppose ur google talk is installed in c:/ drive.Than All u need is to make D:Program FilesGoogleGoogle Talkgoogletalk.exe as this D:Program FilesGoogleGoogle Talkgoogletalk.exe /nomutex
Mind the space between googletalk.exe and /nomutex





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