Button

screen = peripheral.wrap("top")
mod = peripheral.wrap("bottom")

xM, yM = screen.getSize()
print("Screen size:"..xM,yM)

mod.open(2)

function show(color)
    screen.clear()
    screen.setBackgroundColor(color)
    screen.setCursorPos(3,6)
    screen.write("Kill")

end

while true do
    show(colors.green)
    ev, side, x, y = os.pullEvent("monitor_touch")
    if  1 < x and x < xM and 1 < y and y < yM then
        show(colors.red)
        mod.transmit(2,2, "top")
        sleep(0.25)
    end
end