function openNetwork(channel)
	local modem = peripheral.wrap("back")
	modem.open(channel)
	print("opened modem")
	return modem
end

function main()
	print("running main...")
	while true do
		sleep(0)
		paintutils.drawPixel(x,y,colors.white)
	end
	return
end

function onKey()
	while true do
		print("waiting for keypress...")
		local event, key = os.pullEvent("key")
		print("detected keypress")
		if key == keys.z then
			y = y-1
		end
	end
	return
end

term.clear()
modem = openNetwork(42)
x = 5
y = 5
print("launching processes")
parallel.waitForAll(main,onKey)