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A little tweak that will allow users to run multiple yahoo messengers on a same machine.
If you’re looking for ways to run couple or more yahoo messengers in the same machine then this article would be great help for you.
Yahoo Messenger let users to test their messenger by making a tweak in registry. To accomplish this key value for HKEY_CURRENT_USER\Software\yahoo\pager\Test has to be altered. The key value is set to true then the messenger will function in test mode and users will be able to open up multiple instance of yahoo messenger.
To make yahoo messenger to open up multiple instance, you need to modify the registry key value. Here is a cut-short way of doing that.
Save the below code with .reg extension and double click to execute it.
REGEDIT4
[HKEY_CURRENT_USER\Software\yahoo\pager\Test]
“Plural”=dword:00000001
Once the above code is entered into registry yahoo messenger will function in Test mode. To revert back to normal mode use the below code in same manner.
REGEDIT4
[HKEY_CURRENT_USER\Software\yahoo\pager\Test]
“Plural”=dword:00000000
The above will the remove the feature of having multiple messengers open.
Happy chatting 
