VS 2010 Server to send messages to multiple clients

Hi Guys, I'm working on a project that would use a server and multiple client PCs. Here's what I want to do:

Attachment 94643

multiple clients are connected to the server. The server can then enable or disable a PC by a click of a button.

Here's a sketch of the Server UI

Attachment 94645

all client PCs will be disabled by default. (by using a lock screen vb program)

if the user clicks button "PC 1" (192.168.1.101), PC 1 would be enabled. then if the user clicks PC 1 again, it would then be back to being disabled.

Any idea on this guys? I've tried using simple chat programs but the programs are kind of complex for me. only a newbie in VB 2010.

thanks! :)