hello!

Is it possible to define a plane
which is transparent for light only in one direction and doesnt appear
as object at all  ( it mustn't be seen!) and it mustn't be reflective on
both sides.


like a Glass throuh which i can look only through one direction 
I need it for the following:

I stand at a point and look out through something like a window.
I want to see everything outside the window.
I also want to see if a spotlight from inside illuminates something
outside the window.
But if a spotlight outside the window points at my window, it mustn't
illuminate anything in my room.
Is such a thing possible?
And how?
Thanks for every answer
Matthias

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