a wireless mesh topology, like a regular mesh topology, but instead of all clients on the network being wired up, they simply just connect via wireless
for connecting 4 computers you would need a "hub"(en.wikipedia.org/wiki/Network_hub), and a cat5 cable to connect each computer to the "hub". each computer would also need a "network card"(en.wikipedia.org/wiki/Network_card), alot of modern computers come with a network card integrated so you may not need to purchase it separately.
All new laptops come with wireless network cards already built into them
Wireless adapter cards do not cost a monthly fee, all the adapter does it connect to your wireless home network and allows you to access the internet.
USB Ports enable use of External Devices such as Wireless Network Cards & Hard drives on Notebooks.
wireless access points, wireless network interface cards (NICs) and routers.
An ad-hoc network is a wireless network in which all connections are wireless. The only devices required are wireless network interface cards in all of the devices that want to participate in the network.
An AGP card is a graphics or display card and will allow output to a monitor. A LAN card is a Network Interface Card which allows a computer to communicate over a network, either wired or wireless.
It is prevent all connected network cards sending at the same time.
There are a few potential benefits in using a wireless USB network adapter. They allow one to connect to wireless networks on the move and connect using laptops that don't have built in wireless cards.
Start->Control Panel->Network Connections. After you will see all network cards including wireless. By right clicking on of your wireless connections (if there are any and more then one) you can change settings for the particular wireless card and as result for particular wireless networks.
You have to get wireless Network Interface Cards and the wireless router.The best price you can get on a wire NIC is around 25$ and a wireless router starts at around 40$(and goes up).So if you've got four PCs on your current network that's around 140$ minimum to go wireless.
The beacon interval is the time interval between the transmission of beacon frames by a wireless access point in a wireless network. It helps synchronize the timing of devices in the network and allows devices to know when to listen for important network information. Shorter intervals can improve network performance but may increase power consumption.