Write a remote Application

I need a small back door file to be written that allows a remote connection to a workstation. It must be able to allow me to connect to the computer running the file and see the screen, nothing else, i dont require any controls or anything else. Must be able to get through anti-virus and must be able to notify when the application is active. I dont want a virus, as this will only allow the connection when the file is being run. Please pm me for more