Steps to enabling multiple instances of GTalk:
1. create or locate a shortcut to your installed GTalk executable
file.
By default, the executable file is
"C:\Program Files\Google\Google Talk\googletalk.exe"
2. to Target value of this shortcut, add
/nomutex
[shortcut file :> right-click>> properties>>target]
now every time, you launch GTalk with this shortcut, you get a new
instance of GTalk launched and sign in with a different email id on
same computer
Enjoy!
you may like to have a look at file GTalkShortcutProperties.JPG in
Files section:
http://groups.google.com/group/windows-troubleshooter/web/GTalkShortcutProperties.JPG