have seen some versions of yahoo messenger under the name yahoo multi messenger.Actually there is no need to use such Multi Messenger Versions.
Logging into more than one account in yahoo messenger is possible. To do this no special software is required. Just follow these simple tricks. By this you can easily convert your Yahoo messenger to a multi messenger.
Just download this file and merge it into the registry.
Now to use Multiple yahoo’s just double click yahoo messenger again and you will get the second one and so on..
If you prefer to do the above trick manually by yourself without using any registry file then this trick is for you
1) In Run Type in regedit and press ok
2) On the right pane Create a new dword value with name Plural and value 1
3) Exit the regedit and then open multiple copies of yahoo messenger by double clicking yahoo messenger again and again.
Enjoy multiple logins..!!