Webcam - Microphones - File sharing on my local network

[cmn]

Hello peeps,

Im on a network (linksys) ethenet du da and have 4 comps on the network. I want to share files, Go on webcam and talk to them on a microphone but programs such as msn do not alow it. Please help. Are there other programs out there that allow me to do this?
Thanks

 

[nagual]

I think that yahoo messenger allows voice chat.