This will enable you to open multiple yahoo messenger at the same time, login with multiple different YM id`s in one PC.
1.Click Start button
2.Then Run --type regedit
3.Locate this address:
HKEY_CURRENT_USER/Software/Yahoo/Pager/Test
4.Right side panel, right click to create a new Dword
5.Name it "Plural" and give it a value of = 1
(If you want to disable the multiple messenger option-open registry editor and change Plural value 1 to 0.)
6.Restart PC
clap!
