startup.lua

id = 8
term.setBackgroundColor(colours.green)
x, y = term.getSize()
term.clear()
term.setCursorPos((x-6)/2, y/2)
term.write("Toggle")
rednet.open("back")
while true do
    event, p1, p2 = os.pullEvent()
    if event == "mouse_click" then
        rednet.send(id, "open")
    end
end