Glass Screens And Laser Pointers

I go to many places for talks. And use power-point presentations.

There was a place with excellent built in screens.

The power-point material came out beautifully.

But whenever I used the Laser Pointer, the red dot disappeared when it reached the screen. It disturbed my talk. I managed because (God's Grace) I do everything extempore.

But my mind was working on the problem.

Later I found the screen was of glass. Naturally laser beam goes through it and no red dot. On an opaque screen, it will appear.

May be somebody has designed it already.

If not, can some of you design a pointer for showing dots or arrows on such glass screens?