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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Installer showing part of the EULA.
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ActiveWorlds lets you visit and chat in 3D worlds that are built by other users.
The Active Worlds Universe is a community of hundreds of thousands of users that chat and build 3D virtual reality environments in millions of square kilometers of virtual territory.
