Multi Login Yahoo

Multi login Yahoo is a little bit comlex than that of the multi login Gtalk.
Here is the steps to multi login Yahoo.
First go to start and type "run" and enter.

Then type regedit.exe and the press Enter. Press yes when asked then you have the following window.

Then i.e, go to the location HKEY_CURRENT_USER\Software\yahoo\pager\Test in t
he right pane,right click -> new -> dword (32bit) value ,and name the file as plural. 

After that right click plural and modify value data to 1. click ok.

 Now you can enjoy multiple chatting.