Help setup a Linux Network!?

I am open to all suggestions! (It does NOT necessary need to be Linux, any other cheap solution is welcome too!) What I need: Set of 12 clients that are controlled by 1 server. Use of clients: 1-Only show 1 single internet webpage. People cannot browse away from this specific webpage. They can only click within this same website. 2- There is an instant messenger on each 'client' so if someone behind client surfing on my website have question then they can ask it instantanuoulsy by instant messanging. I must be able to know exactly from which client question comes and could reply to it from my own PC or laptop (internet connection available!) 3- All clients can be switched ON and OFF at once by 1 command or button from the Server. 4- Cheapest possible licensing! I don't need windows on all those individual clients because I will only use them to browse my website. It would be a waste of money to install windows on them i think. (so Linux is the only solution?) I will accept any provider for this project if: - You can connect remotely to Server PC so you can configure anything - You have time to do this within 2 days! (Server is already built! and I have 2 internet connections!) - You understand the requirement and could do this fast and on a professional way Feel free to make some suggestions on how to setup this network as use of it is very minimal (browsing only my website, remaining websites on internet is not allowed to surf on!) Please send me PM only!!! And start with 'cheap_network' so I know you are placing a real bid and not fake/automatic one.