wireless projector

Hi all!

I had a wirless projector question.

I recently purchased an epson wirless projector to use while I travel to do trainings. It seems to not allow me to project wirelessly from my computer if I am already logged onto to another network, basically it wont let me talk to two networks at once. This is not a problem most of the time due to the majority being PowerPoints or something on my computer but what about when I want to project a website or software type training that is on a network? Is this just something that this particular wireless projector does not do or is this common for all wireless projectors? If this is the standard I will keep it, but if a different type allows for this I would rather send it back and look elsewhere. Any thoughts or inside info?