anyway to have MP server w/out hamachi and other PIA ways

[Mini Colossus]

I finally got a friend to get Minecraft, and I want to play tekkit with him. Just him. I don't want to join a server. I don't want to go over his house and d/l hamachi on his new computer to connect to me. I know (or think i do) that vanilla MC has some kind of internal, easy way to essentially play SPS with a few friends. My computer isn't great and using the tekkit server program in the background is pretty laggy. Any help or tips on the best and easiest way to have tekkit fun w/ less than 5 people?