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