>> Right click ont Google Talk icon on your Desktop and go to properties.
>> Now click on Shortcut tab
>> Now you will see:
"C:\Program Files\Google\Google Talk\googletalk.exe"/startmenu " in the Target box.

>> Add "/nomutex" at the end of the target box's link after a space and it finally look like as
"C:\Program Files\Google\Google Talk\googletalk.exe" /startmenu /nomutex
if you face problem then i suggest you to copy the above link and replace the existing link of Target box of your GTalk.
>> After that, click on Apply and Ok.
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Now you can open multiple Google Talk as many as you wish clicking on GTalk icon i.e. if you want to open 3 GTalk simultaneously then you have to click 3 times on the GTalk icon.
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