If you are using GoogleTalk and want to use another id At same Time then here is a simple tutorial to demonstrate how to run Multiple Google Talk(Gtalk) 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 you can 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.