How to Multiple login in yahoo Without Using any Software

You can login with multiple id's on the same yahoo messenger without any download or patch .
Follow these steps :
 
1.   Go to Start ----> Run . Type regedit, then enter .
2.  Navigate to HKEY_CURRENT_USER --------> Software ---> yahoo  --->pager---->Test
3.  On the right page , right-click and choose new Dword value .
4.  Rename it as Plural.
5.  Double click and assign a decimal value of 1.

Its done!!
Now close registry and restart yahoo messenger and try Multiple Login