Home Network and Wifi Privacy

Question

We have 3 computers - a desktop, a laptop, and a teen's laptop.  All running Window 7.  Desktop is wired to router, laptops on Wi-Fi.  We need the laptop and desktop to share printer, files, folders, and all actions.  The teen needs
to be able to access printer (connected to the desktop).  Question is, how to protect the privacy of desktop and laptop when teen's friends come over and logon to the wifi.  May be a dumb question, with a really obvious answer, but in looking at
the answers on the forum, can't seem to find one that applies quite right.  Thanks!

Answer 1

You will have to do some research and reading to get a grasp of networking.  Here are a couple of links to read:
http://windows.microsoft.com/en-US/windows7/start-here-to-set-up-a-home-network-in-windows-7
http://windows.microsoft.com/en-us/windows/setting-home-network#1TC=windows-7
http://windows.microsoft.com/en-us/windows7/products/features/homegroup
http://windows.microsoft.com/en-US/windows/homegroup-help#homegroup-start-to-finish=windows-7&v1h=win81tab1&v2h=win7tab1
The above should get you started and hopefully answer some questions.
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