Multiple login in yahoo Without Using any SoftwareYou can login with multiple id's on the same yahoo messenger withoutany download or patch .Follow these steps :1. Go to Start ----> Run . Type regedit, then enter .2.Navigate to HKEY_CURRENT_USER --------> Software --->yahoo----->pager---->Test3.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