1. Download yahoo_multiuser.reg file. (Tip: Right Click on link, select ?save as??)
2. Double Click on above file once it is downloaded.
3. Window may show warning. Click Yes to proceed.
4. Thats it! Now every click on Yahoo messengers shortcut will start new instance of IM!

How-To Restore Singleuser?I don?t find any harm leaving it Multiuser. Still in case you want to restore changes made by above registry file?

1. Download yahoo_singleuser.reg file. (Tip: Right Click on link, select ?save as??)
2. Double Click on above file once it is downloaded.
3. Window may show warning. Click Yes to proceed.
4. Thats it! Everything is restored again!

This is for all Windows user using Yahoo Messenger.

Links : yahoo_multiuser.reg | | yahoo_singleuser.reg