both.lua

local component = require("component")
local computer = require("computer")
local alarm = component.os_alarm
local entity = component.os_entdetector

allowed_players = {"andyipod1437", "MoreUsers", "EvenMore"}
range = 64

while true do
  clear = true
  players = entity.scanPlayers(range)
  for _, person in ipairs(players) do
    uservalid = false
    for _, allowed in ipairs(allowed_players) do
    if allowed == person.name then
      print("Detected allowed player:" .. person.name)
      uservalid = true
    end
    end
    if uservalid == false then
      print("Detected invalid player:" .. person.name)
      clear = false
    end
  end

  if clear then
    alarm.deactivate()
  end

  if clear == false then
    alarm.activate()
  end

  os.sleep(1)

end