So my bro and I have the same router (means same IP and all that good stuff). And I would like to know if he is able to join the world without me starting up the Minecraft_Server.exe on my laptop. Like when he wants to play our world, how can he do so without me starting up and doing anything? His friend did it for him and his friends.

Also, don't say to ask his friend. He's not able to be reached for a little while.

Thanks in advance.