If u r using GoogleTalk and want to use it more.... here is a simple tutorial to demonstrate how to run multiple GoogleTalk on your pc...

A Shortcut to google talk on your desktop / start menu / quick launch bar will have a target address like this....

    ?C:\Program Files\Google\Google Talk\googletalk.exe?

All you got to do is to change target to....

    ?C:\Program Files\Google\Google Talk\googletalk.exe? /nomutex

The /nomutex is the key here and now run multiple googletalk.

Step-by-Step Procedure:

   1. Right-Click on any shortcut (preferably on desktops shortcut).
   2. Select properties from context-menu!
   3. U will get a window like below!
   4. Go to shortcut tab!
   5. Edit target as mentioned above!
   6. After editing it should look like below!
   7. Thats it save n just click on that shortcut everytime u want to run a new instant of GoogleTalk.

Here is screenshot...