Also whilst on the subject of conectivity
when using a network cable as the link between computer and control as in the .net system, using cheap network cable can cause failures due to the fragile nature of the cable especialy if its solid core,
expensive network cable is ..... well Damn expensive
a more robust and cost efffective solution would be to use a standard 100m Mains extention lead plugged into the same outlet as the computer
then run the ethernet over the mains to the projector using this
http://www.cyberselect.co.uk/product/1275
all the best .... Karl