Hello,
Yes you will need wireless PCI LAN cards for your computers and a wireless PCMCIA LAN card for your laptop. You will also need to have a Wireless Router. (802.11b)
A access point and a wireless router are the same thing. A access point is where you can connect to the internet (via a 802.11b network adapter) in a public place (normally cost you) (every startbucks is starting to do this). You will want to buy a Wireless router for your home network.
I wireless router and a wired router are pretty much the same thing...
The only real big difference is that a wireless router broadcasts the internet signal though the air (802.11b) and not down a Ethernet cord.l
Yes you can get a Wireless router that has both Wireless Broadcasting and Ethernet port plug ins (There is one sitting next to me right now
)
There are also a wireless Ethernet adapter for the XboX I herd but I think it runs any where from $130 to $150.
You network adapters that are though walls can still connect to the wireless router but when the router says "1500 feet" they mean in a open field with nothing around
... Walls will cut down on the length it will go but you should be fine... I have on about the same distance away running though about 3 walls (if it is not going though the door 4)
The kernel (as far as I know) DOSE NOT have wireless support BUT you still can get it. There is a wonderful group that makes the linux-wlan project (which stands for Linux-Wireless Local Area Network or Linux-Wireless LAN) They now also have the Linux-Wlan-ng which supports 11 MBPS cards... (By The way I don't think the kernel ever will because the computer reads the connection the same... It is up to the card manufacture or Linux-wlan to make "drivers" linux can use.)
There address is linux-wlan.org. But make sure they support the card you are buying (or the card you are buying supports linux)
I hope that sheds some light,
Andrew