hello, sorry if i post wrongly in this tread...but still this is concern about game programming

currently, i m doing a very simple battle tank game...which can be played thru a LAN network....but my program is required to be automatically obtain a list of game server from the LAN network...like "CounterStrike" which can show all teh available game server..

i heard some soft of Multicasting in network porgramming..Do any one knwo how to code in VB?