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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ThreeMessenger Client/Server Instant Messenger Suite has instant messaging, server side audit log, encryption, conferencing and file transfer for companies. They also compress all files sent and then decompress after transfer.
