If you have a laptop or a PC with a wireless network adapter, you can see a list of available wireless networks in your area, and then connect to one of those networks. The wireless networks will only appear if your PC has a wireless network adapter installed, the adapter is turned on, and the wireless access point is in range.
If you have a lot of wireless access points within your area, then you could have a lot of SSIDs (network names) in your available wireless networks list.
A wireless filter will allow you to be able to add or remove the SSIDs (network names) you want from showing in your list of available Wi-Fi networks.
This tutorial will show you how to add or remove wireless networks from the wireless allowed or blocked filter list for all users in Vista, Windows 7, Windows 8, and Windows 8.1