If you are big fan of Google Talk, you might have got multiple accounts and if you want to login to all of them at same time, then follow below simple steps:
Download and Install Gtalk from here:
01. The installation will create a shortcut on your desktop or else go to Start -> All Programs -> Google Talk -> Google Talk and Right click on the icon:
02. No matter to which drive or directory you have installed it, just Change /startmenu To -nomutex at the end of Target file path and Press Apply and Ok.
All done. Now you can run run Multiple Gtalk Clients and can Login to different Google accounts at once. Hope you enjoy this. If you have any problem, please feel free to ask me.