open multiple yahoo id's in same computer

You can login with multiple id's on yahoo messenger without any download or patch. Only thing you have to do is a change in windows registry.
Follow these steps :

1. click on 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 enjoy multiple login...