Also called "Chat Programs". These applications are installed on a PC by a user, and allow immediate "chats" between other users of the program. Some of these programs also allow audio or video conferencing as well as the ability to execute file transfers.
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Simple Instant Messenger can be run as both server and client. As a server, it can link up with many other Simple Instant Messenger servers to provide a single online user list. It also provides message encryption.
