You can have multiple instances of yahoo messenger which can be used to login with different IDs – without any download or patch .
To have multiple instances of yahoo messenger, 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.

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