function options()
    print("Options:")
    print("Start")
    print("Stop")
    print("Return")
end

rednet.open("back")
print("Enter 'q' to exit or 'help' for commands.")

while true do
    cmd = string.lower(read())
    if cmd == "q" then
        break
    elseif cmd == "help" then
        options()
    elseif cmd == "start" or cmd == "stop" or "return" then
        rednet.broadcast(cmd)
    else
        print("That is not a command, please enter 'q' to exit or 'help' for commands.")
    end
end