----Startup----
local modem = peripheral.wrap("back")

termX, termY = term.getSize()
modem.open(1)
--------------
function toggle()
    modem.transmit(1, 1, "toggle")
end

function LockScreen()
	term.setBackgroundColor(colors.black)
	term.clear()
	term.setCursorPos(1, 1)
	term.setBackgroundColor(colors.red)
	term.write(string.rep(" ", termX))
	term.setCursorPos(1, termY)
	term.write(string.rep(" ", termY))
	term.setBackgroundColor(colors.black)
	term.setTextColor(colors.red)
	term.setCursorPos(termX/2-3, 3)
	term.write("Lock")
end
function UnlockScreen()
	term.setBackgroundColor(colors.black)
	term.clear()
	term.setCursorPos(1, 1)
	term.setBackgroundColor(colors.green)
	term.write(string.rep(" ", termX))
	term.setCursorPos(1, termY)
	term.write(string.rep(" ", termY))
	term.setBackgroundColor(colors.black)
	term.setTextColor(colors.green)
	term.setCursorPos(termX/2-3, 3)
	term.write("Unlock")	
end
--------------
event, side, xpos, ypos = os.pullEvent("mouse_click")
-------------------------
if event == "mouse_click" then
 toggle()
end
event, modemSide, senderChannel, replyChannel, replyChannel, message, senderDistance = os.pullEvent("modem_message")
if message == "UNLOCK" then
LockScreen()
end
if message == "LOCK" then
UnLockScreen()
end
sleep(0.1)
shell.run("startup")