you will need to go buy a usb wireless adapter. this is what I have for my nonwireless computer. www.newegg.com
If you want to have internet on that laptop you need to be connected to internet provider which usually happens directly (connected to the modem) or indirectly (connected to the modem through wired or wireless router).
a wireless modem means it has a wireless router built in. A wireless router means just a wireless router. if your modem is not wireless, you will need just a wireless router
through wireless modem
install a wireless card on your laptop, and have wireless internet (via modem) in your home
wireless modem is a modem built in with wireless router, people use router seperately to connect to internet because their modem doesn't have a built in router. you can replace a wireless modem to a wirelss n modem.
Yes it does. It can be in the form of a PCMCIA slot wireless modem or a USB wireless modem.
You buy a wireless router, wire the desktop and router to the modem, and use the laptop by getting a wireless card or usb wireless adapter.
You can connect your laptop to the Internet with a cable modem, sure. You will need an Ethernet cable to do that. If you want wireless internet, you will need a cable modem, and a wireless router as well.
Probably not because most of them can only get up to 10 mbps.
if modem has wireless capablity, then no need for a router
Look at How can you speed up your wireless internet? for the answer