Windows xp maybe 2000 has one call winchat go to command promt type in winchat
or you can use windows net chat also go to command or run cmd type in net view see the computer on the network you want to send a message to then type net send "what ever the computer name" then the message
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or you can use windows net chat also go to command or run cmd type in net view see the computer on the network you want to send a message to then type net send "what ever the computer name" then the message
something like this
net send paul You suck!