Ok I came up with a card thru window, very effective, and I am already using it. Theonly problem is I do not own any card thru window on the market, so I have no idea if this is an original thing, or if it has been invented before. Does anyone know where can I find this information, how do I klnow if this has not been invented before, how can I copyright it?

Thanks
Marien

There are a few folks around who have an interest in this classic effect and the methods used to accomplish it.

These people are respectful of other's work and will respect the ideas and mechanics you discuss with them. If you really want to do this yourself, the research could get a bit expensive.