The use of a router that supports both wireless and wired connections would solve the
problem, if I understand properly. Make sure it is a ROUTER, not a switch or a modem.
You will need a router, wireless adapter, to have a network connecting computers
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.
Many Wireless routers and switches have few inbuilt switching ports capable of connecting Wired computers to Wireless Computers on the same network to connect wired Computers also alongwith. (Not necessarily every every wireless router will be having switching ports)
PAN
It would depend on how far away the computers would be from your wireless network. You can connect multiple printers to a wireless printer, I am sure if it is a small business you can connect all.
Yes, it can. Use internet port as a communication port with the network you want to connect to.
The Cisco Wireless Network works by making all of the computers connect to the internet through the same router. Most Cisco routers have the wireless connect by using a password so others can not steal the bandwidth.
The easiest way to set up a new network laser printer to a network is to use wireless. The printer will simply connect to all computers on that wireless network.
To connect a computer to other computers (i.e. to a network) you need a network adapter, also called a Network Interface Card. This adapter should be suitable for a network which you want to connect to. Wireless adapters are for wireless networks, wired adapters are for wired networks.A network connection.if its file sharing a local network over your lan, or if its a game, social networking site on the internet its the internet.A network card connnects to a router (wireless or LAN) the the router connects to other computers or a modem (intranet-telephone interface)
Buy a lan router, they can be used with lan cable or wireless to connect all your computers through a network. If there are only two computers that you wish to connect then you only need on lan cable which you connect in the back of each of those two computers to create a network.
There is no extra cost to set up a wireless network. Your connection comes into the home via your cable or telephone line which is connected to a router which provides a wireless connection . These are widely available. Your computers can then connect to your wireless network.
Connect a wireless network adaptor to the computer and configure the adaptor to connect to the wireless network that has the files you want to access.