Noun
screenname (plural screennames)
(computing) a string of characters used to identify a user of a bulletin board, e-mail etc.
It was acquired by AOL on August 3, 2005 and closed on January 12, 2009. citation It offered a free 5 GB account (free online file storage ) to anyone with an AOL screenname. Source: Internet
To add a buddy, the addbuddy message is used, with the screenname parameter aim:addbuddy? Source: Internet