You first need to be more specific in your question before anyone can help you:
a) What kind of desktop are you running (Win, Mac, Linux, etc, and what exact version)?
b) Do you mean change its settings or change to another wireless device?
Yes, it can. But you have to get a wireless adapter which can be either PCI, PCIe or USB.
Most wireless connections also require the use of a WiFi router when using a USB Connector for a second desktop if the Internet connection is hard wired to a desktop computer. If the main Internet connection is a WiFi antenna on the building, then a wireless router is usually not necessary, but the USB Connector is necessary for a desktop computer.
You need to get a wireless adapter for that, either external such as USB, or internal such as PCI, PCI-E and so on.
No, USB wireless cards are slower and receive a weaker connection signal than internal wireless cards.
Yes ... it's called Wi-fi, or a wireless connection using a wireless router perhaps.
I have a laptop and it is the only computer in my house and it is set up wireless with a router, the router is hooked into the modem.
A WLAN is a wireless LAN. This is what you need: 1. An internet connection 2. A Wireless Access Point that connects to that internet connection 3. A wireless card in your desktop 4. Configuration of the WAP to provide DHCP That's about it
No. The USB connection will be used to pass the data, not a LAN card.
Yes, you can. Just your desktop to the router which have recently got. You will able to use your laptop as well as your desktop.
Nowadays routers usually have both wireless and lan connection. So when you buy a wireless router just make sure that it has a lan switch too.
Try this setup: Cable/Dsl Modem---->Wireless router---->wireless devices, desktop.
ha ha ha