They can join your network. When they right-click on your network name,
they should select Copy IPv4 Address and use that in the Minecraft client to
connect to you.
When you don't want your friends connected, just click the power-switch icon
to turn your network off.
The Harder Way: By Hand
To set up your computer to be open and findable on the Internet without the
help of something like LogMeIn isn't magic, but it does take some work. Here
are some advantages of doing it the “hard way”:
•You can connect more than five users if you want.
•You can be available to the whole world, not just your friends.
•It's really interesting and useful stuff to learn.
You'll need to learn a little bit more about networking and how the Internet
works. I'll outline the important steps here, but you may need to do some
additional reading on your own. Most importantly, I can't give you exact step-
by-step directions because every router (or cable modem, DSL modem, and
so on) is different. But you can find that information online with help from
Let's look at the steps.
First, your friends need to find your machine.