By default Yahoo Messenger lets only one person to be logged in on one computer.
However, with a simple registry tweak (without using any other software), you can use multiple instances of Yahoo messenger on a single computer, each logged in with a different user id.
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If you’ve got many Gmail accounts and don’t want to keep logging on and off them every time you want to switch account, a simple command line parameter in the Google Talk shortcut can solve your problem. First, create one copy of the Google Talk shortcut on your desktop - leave the original intact. Right-click [...]

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