Setting up Windows Server 8 to enable simultaneous multiple remote logins to specific applications / windows running on the target machine

This is a simple project setting up and combining existing software to achieve the folllowing: I want my computer (entitled MAIN COMPUTER) to be able to accept concurrent remote logins and sessions from up to 15 multiple independent computers (entitled LOGGING IN COMPUTERS) over the internet. The unique UI (user interface) for each individual and independent LOGGING IN COMPUTER will be an individual specific window (or a combination of up to 5 windows) already open on the MAIN COMPUTER. Therefore the following can be achieved: The operator of the MAIN COMPUTER logs in to several different chatrooms - each individual chat room (constantly updating with other members' chat) is an independent open window on the MAIN COMPUTER. [sidenote the MAIN COMPUTER will be broadcasting its webcam to every chatroom]. The MAIN computer will possibly have up to 25 windows (25 chat rooms) logged in at any time. The LOGGING IN COMPUTERS log into anything from 1 window up to 5 windows each on the MAIN COMPUTER through the internet. [as a sidenote the LOGGING IN COMPUTERS will arrange their own display on their own desktops so if logged into 5 windows the windows are resized to fit onto one display]. Please only bid if you have installed windows server OS before, if you know what .rdp files are, if you know how RemoteApp works, if you know what .msi packages are, if you are an expert with enabling multiple remote login sessions to windows or applications running on a server. I have had my time wasted by bidders already professing expertise but not being able to deliver.