You will need to use an Ethernet connection in this case. Ethernet is a lot faster than a phone line. You will need a coax jack and a modem in order to have an Ethernet connection. For more convenience, you can just get an Ethernet wall jack installed if you don't have one yet, and you can just get an Ethernet cable to connect from the Ethernet wall jack to your computer, giving you a high speed internet privledge.
Question is not proper.
Assuming that by CPU you are referring to a separate desktop machine, you can use a crossover ethernet cable to connect them directly
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Yes, you can use your laptop without a battery as a desktop, but it can be damaged the laptop components.
Install xp on the laptop. A laptop won't work without an operating system.You can do this. But how do you mean "connect"? If you want to share files, then here's a way. If the laptop has a floppy drive and a network card you can make a network bootdisk to boot the laptop and connect to the laptop using ethernet . This will allow you to access shares on the desktop and u can copy over files from the laptop to the desktop but you can't access the laptop from the desktop.You can also try "LapLink" google it for more info.
You may be able to establish an Ad-Hoc connection between the Vista Desktop and XP laptop. I've never tried it, therefore google is your best friend. Search "Connect desktop to internet via Laptop)
You can connect the laptop hard drive directly to your desktop and get your files back.
Just connect the Ethernet cable (RJ-45 crossover) to the laptop .Then you will get the connection.
Yes ... it's called Wi-fi, or a wireless connection using a wireless router perhaps.
Buying a wireless card depends on if your wanting to use the laptop while not near the desktop. You can buy network cables to connect the two computers as well.
It depends on how it's set up. If the wireless router is connected directly to the service, you should be able to connect the laptop without the desktop being turned on. If the desktop is connecte directly to the service and the router feeds from the desktop... no, you'll need the desktop to be running. No Its Doesn't.You Just Need A Modem To Be Connected To The Desktop Computers Ethernet Port
Your router should have a wireless network. Read the manual for how to enable it and set up a key, then connect to it with your laptop. Or just use a cable like with a desktop.