Multi-client Server??(編號:1405)

各位人兄...,
小弟想問一下 where can download a sample/similar program or get some informations about how to do a multi-clinet server!! in the program clinent can send data to each clinet and clinet can also can send command to server to control Mscomm ka!!
If u know any site or search sites have those program, pls inform me ar!!
多謝大家幫忙.... 小弟感激不盡...