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1. Go to Start -> Run . Type regedit and press Enter.
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2. Navigate to HKEY_CURRENT_ USER -> Software ->Yahoo ->Pager->Test.
3. On the right page , right click and choose New Dword Value .
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4. After it is created rename it as Plural.
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5. Double click on it and give it a decimal value of 1.
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Start Yahoo! Messenger and login to your account. Open again Yahoo! Messenger and you will see that a second login window appears.
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