Definitions for "Instant messenger"
Keywords:  buddy, messenger, msn, chat, friends
Software that lists users' selected "buddies" (friends, family, co-workers, and so forth) who are online and enables users to send short text messages back and forth to them. Some instant messenger programs also include voice chat, file transfer, and other applications.
A service that lets you know which of your friends and online buddies are available and provides the means for you to privately communicate with them.
A way to chat online. Netscape Online Instant Messenger is software that allows you to chat with other users.
Instructional Designer (ID) Interoperability