Windows that let light through?

Is there a way I can build a window (transparent object) that will let light pass through it. If not is there a way to simulate that.

I want to build a ship that has reflected in the windows the outside enviroment but also see the inside of the ship. I also want the shadows of the available light that is passing out from inside the ship to be scene on the outside.

When I put in a window or transparent object ther is no light passing through it. I can see inside but there is no light making it outside.

Any help appreciated.

set on the materials of the objects that you want to recieve light going through the window the trashadow option and use a ray shadow

I wondered what that was for. Thanks for your help