Multiple login in Yahoo messenger from same computer !!

Yes it is possible.

This is a little, very simple trick with not additional patches or any third party tools involved. A simple tweak to your registry will do the trick and I will show you how.

1. First up, open your Registry Editor (Run… > “regedit”)
2. Go to HKEY_CURRENT_USER > Software > Yahoo > pager >Test
3. You need to add a new key. Right click, select DWORD Value and rename it to “Plural”.
4. Now, open the value of this new key by double clicking it. Set the Value data to 1 and select Decimal for Base.
5. And you are done! Close Registry Editor and restart Yahoo! Messenger.

[Editing Yahoo Messenger registry to enable multiple login]

To sign in with another Yahoo! ID, simply launch another Yahoo! Messenger.

It is that simple!