I am polling specific networks rather than specific instant-messaging applications since some networks can be accessed by more than one program; for example, the AIM network can be accessed through AOL Instant Messenger, Netscape Instant Messenger, iChat for Mac OS X, and even unofficial clients such as Gaim and Trillian.
For what it's worth, OSCAR stands for "Open System for CommunicAtion in Realtime," the technical name of the protocol used for the AIM and ICQ networks.
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