Minecraft Forums

About a year ago, a friend of mine said he wanted to show me his world, I said sure load up the server, and he said he didn't need to, he just did the LAN thing, and I was able to connect via his IP, even though it was LAN. He said it was a port, but didn't tell how to do it. I'm now wanting to do this to just play with a few friends instead of set up a full on server. I'm wondering how I can do this, or what port I have to open to do this.