LAN Messenger
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A LAN messenger is an instant messaging program designed for use within a single local area network (LAN).
The first LAN messenger for Microsoft Windows is Winpopup, a small utility included in Windows 95/98/Me intended to receive and send short instant text messages. Winpopup uses SMB/NetBIOS protocol.
Windows NT/2000/XP improves upon this with Messenger Service, a Windows service for receiving and sending messages compatible to Winpopup. On systems where this service is running, the received messages "pop up" as simple message boxes. Any software compatible with winpopup, like the console utility NET SEND, can send such messages.
By default, Messenger Service is off in Windows XP SP2 and blocked by Windows XP's firewall.
Many alternatives for MS winpopup and NET SEND use proprietary TCP/IP protocols.
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