Follow the following step to Open Multiple Yahoo Messenger
First Close Your Yahoo Messenger
1)Click Start->Run->regedit
2)Click on Hkey_Current_User
3)Software
4)Yahoo
5)Pager
6)Right Click on "Test" than select New-> Dword Value and Rename it as Plural
7)Right Click on Plural and select Modify and change Value data=0 to Value data =1
and than press ok.
