Type regedit in RUN command and Navigate to the following registry branch.
HKEY_CURRENT_USERSoftwareyahoopagerTest
In the right side pane, right click on the registry and select “New -> DWORD” registry value. Name that registry value as “Plural”, and assign it the value 1(decimal).
Note: To disable multiple login of yahoo messengers, change the “Plural” registry value to 0, or delete the “Plural” registry key.


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