If you mean a wireless network connection - you should buy a WiFi adapter (USB or PCI or PCI-e), install it in your computer and then set-up a new network connection.
If you mean wireless as no-cable-power - there is a problem. Desktop computer uses much more power than laptop and no battery can power it for a time longer than few minutes.
You will need a wireless router and a wireless adapter to have wireless pc to pc connection
You have to have a Ethernet or Wireless card in your PC, then you can connect via Ethernet cable or wireless.
Bluetooth
For a PC, hook it up via USB to a PC that is connected to said wireless network. Make sure it is connected, and then enable printer sharing in Network Connections. That's pretty much it for PC.
No the location of your PC will not matter.
You need a wireless controller adapter for your pc. You can find one on amazon.
Make sure that your PS3 supports type of the wireless network you are using including security if you have one.
You need a wireless network adapter.USB devices are the easiest to install and they won't take up one of your expansion slots.
wireless router
Wireless Networking and a WIFI
yeah, use software such as wiipeer.
It may work with your Desktop. It depends if your PC has the capability to use wireless devices