In this tutorial, we learn how to detect all computers connected to your Wi-Fi network. To begin, go to the website, http://msdn.microsoft.com/en-gb/netframework/aa569263.aspx. Once you are on this site, download and install the program. Once it's installed, open the program and then look for the MAC address. Once you find this, go back to the website and enter this into the MAC address line. After you do this, you will be able to see what computers are listed on your network. If you see any computers you aren't wanting on the network, filter them out and your network will be more secure!