Wireless Routing

Basically, routers split a single internet connection for use by multiple computers. So, yes, you can use a wireless router to connect all 3 computers to a single internet connection. All you need is an internet connection, wireless cards for the computers, a router, and you're set. Just connect the router to the internet connection, and connect your computers to the router.
Setting the router to dial your internet connection is another story, though. It heavily depends of the type and brand of router you get. You should ask the place where you get the router or your internet service provider if you need assistance in this matter.

well, i would try to get all of the computers of the same operating system (mac, linux, windows etc.) so that they can share media like movies and music as well as other files. now to the point. most laptops today have a wireless card built into them so you shouldnt need to buy one. unless you want one for the old computer. or you could just hard wire it if theres already a cable line near the spot where you want it. routers basicly send a wireless internet signal a certain distance from the router

You laptop will have wireless built in. Your desktops will not. You will need to replace your current modem with a router or add a wap (probably the former and your ISP may offer one as part of the contract as an option, or you may want to consider switching ISP to get one as part of their contract, it is more or less the norm for new services these days).

You will have a nework port on your current desktop and should use that to connect to your new router - you need a CAT5 cable for this (often get a short one supplied with a router, so that may do the trick).

You will have a network port on your older and I would suggest runninga longer cat5 cable to that, they can safely be up to 25 metres and still work. Making either wireless is possible, but costs a little more and works less well.

Different operating systems should not matter. Just means you'll have to use different ways to network them.

For your tech needs I commend other sites. Try osnn.net and tell them Mainframeguy sent you for a warm welcome.

GL and enjoy your networking expansion and the wifi world!

If you decide on a router, you can always call their tech guys for a walkthrough on connecting your network and setting your router.

LOL I have a broadband internet connection from BSNL India, the modem is wireless, means 7 computers can work from it at the same time, my son has hooked the3 computers in our home through LAN, another laptop he too uses in the lawn
Yes you can use this facility too.
Thanks for this nice post. keep sharing, happy posting, cheers
ARUN