You may wish to be online with your multiple GTalk accounts. That means you need to run multiple instances of GTalk at the same time. But how do you do that? Follow the following simple steps:
- Locate you GTalk shortcut. You should be able to find it in your desktop itself. If you deleted it go to Program Files, locate the googletalk.exe inside the Google folder, right click it and Send to Desktop.
- Right click the shortcut icon and locate the ‘Target’ input box.
- At the end of the input box type /nomutex
(example: “C:\Program Files\Google\Google Talk\googletalk.exe” /nomutex)
Now create as many instances of GTalk as you wish to 
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This is really cool man
What about logging into Gmail with multiple accounts at the same time 
Just wondering is that possible?