I need to realize a chat room using ASP in the web site. I am using Windows NT which has been installed IIS4.0. I read the book "Professional Active Server Pages 2.0", it said: "The Chat service can be obtained either by purchasing the Microsoft Exchange Server or the Microsoft Commercial Internet System (MCIS) Chat Server." My question is " Is it possible for me to realize the Chat Room without buying the above software and<BR>how ?"<BR> Any advice and suggestion will be highly appreciated.