There are many different ways to login into yahoo messenger with multiple ids at same time. One of the easiest way to do is make some changes in your computer registry!! Follow the steps and enjoy multiple yahoo messenger login on your computer!!
- Click 'START'
- Click 'RUN'
- Type 'regedit'
- Click 'HKEY_CURRENT_USER'
- Goto 'Software'
- Now goto 'Yahoo'
- Now to 'Pager'
- Goto 'Test'
- Now right click in the right hand side of the window
- Click 'New'
- Click 'DWORD Value'
- And just name it as 'Plural'
- Now double click the 'Plural' which you just now created and enter the value '1'.
- Restart your computer to activate the thing you did.