Here is the step-by-step procedure:
1. Open the Registry Editor by clicking on Start > Run and entering regedit.
2. Navigate to HKEY _CURRENT_USER\ Software\Yahoo\pager\ Test
3. Right click on any blank space in the right column and choose New Dword Value.
4. Call it "Plural".
5. Double-click and assign a decimal value of 1.
Now close the Registry editor and restart Yahoo! Messenger, and now you can have multiple logins. (This does not work with version 9, though - Try it! )
(Post Written on: 10/01/2008)