proximity

function getUsers()
	prox = peripheral.wrap("top")
	targets = prox.getTargets()
	for k,v in pairs(targets) do
		if v.Name == "Player" then
		  details = prox.getTargetDetails(k)
		  return details.Username
		end
	end
end

--Rednet
rednet.open("left")
while true do
	id, msg, prox = rednet.receive()
	if prox == "door" and msg == "getUser" then
		rednet.send(id, getUsers())
	end
end