local whitelist = {
    "FriendName1", 
    "FriendName2", 
    "FriendName3"
}

local function isInWhitelist(playerName)
    for _, name in ipairs(whitelist) do
        if playerName == name then
            return true
        end
    end
    return false
end

local function checkForPlayers()
    local players = getScreenPlayers()
    for _, player in ipairs(players) do
        local playerName = getCreatureName(player)
        if playerName and not isInWhitelist(playerName) then
            playSound("playerOnScreen.wav")
            break
        end
    end
end

autoRun(1000, checkForPlayers)
                    

local function f()
    if #getScreenPlayers() > 1 then
        xlog()
        sleep(1000)
    end
end

autoRun(100, f)