Multiple instance of Yahoo messenger

Here is a trick to log into yahoo messenger with multiple ids simultaneously. You would ask why would any one want to do that? The aswer may be that..

1) No one is pinging you on the yahoo messenger, so you might want to ping your other id and talk to each.. just joking
2) Just to spy on a person with different id so as to check if the answer is same.. ;-)
3) Just to keep different friends in different ids

Whatever be the reason, here is the way to do it. I have tested it successfully in version 8.1.
a) Open RegeditGo to Start Menu >>> Run >>> type regedit and press enter
b) Go to HKEY_CURRENT_USER >>> Software >>> Yahoo >>> Pager >>> Test
c) Crete a new DWORD value (right click > new > DWORD Value)
d) Name the DWORD value "Plural" and set the value data "1"

Close the regedit window and start as many yahoo messenger as you want.