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 press Enter .
2. Navigate to HKEY_CURRENT_USER → Software → yahoo → pager → Test
3.On the Right Side Pane , Right-Click in empty area and choose new DWORD VALUE .
4.Rename it as Plural (as it is, P should be capital).
5.Double click on Plural and assign a decimal value of 1.
Now close registry Editor and start Yahoo Messenger!
Note: Previously you were on ble to open one Yahoo Messenger Window now u can open as many you want