In order to use a WiFi wireless projector, which is the most common type, you
will need to install a wireless network card in either the desktop and
notebook computer you are sending information from. A few projectors come
with a wireless PCMCIA card to fit into the side of a notebook computer, but
most require you to purchase network cards separately if you do not have one.
A Quick Setup guide for NEC Projectors is available at:
http://www.necvisualsystems.com/corpus/9/O/WirelessLAN_QSG_v15.pdf
You can probably adapt it for most other projectors and it gives you a place
to start.
