There are six routines given in the DVD but you'll come up with your own.
Basically, a selected card penetrates the glass, then changes into a different selected card while that one is behind glass.
 
There's a beautiful hand-made gimmick INCLUDED.
 
How hard is WINDOW?  Easier than Tarantula but harder than the Ball & Vase.  You won't have problems. 
 
There are several ways to perform the effect.  In the most difficult routine you do a force and a top change.  In the easiest you simply make the card change behind glass. 
The reset is instant.
 
You’ll have a perfect time making your reputation with WINDOW. Order it today.
 
Ultra Visual
Instant reset
Unlimited Possibilities
Hand the card out and leave it with the spectator
Training by FISM winner David Stone
6 Complete routines
Hand-made sturdy gimmick INCLUDED
No one ever sees the gimmick or knows it's there
 
The gimmick takes an hour and a half to manufacture but David Stone makes each one himself by hand.. *David Stone doesn’t really make the gimmicks, he’s too busy performing the trick to people who pay good money to see him. Your hand-made gimmick will be included in your package though, no worries.  :-)
 
Manufacturer Says
Gimmick Included - 5 Complete Routines
The Least Expensive and Most Effective Card Through Window Ever!...

Full dvd training presented by FISM Winner David Stone. Directed by Jean-Luc Bertrand.

Easy to Do - Ultra Visual - Unlimited Possiblities
No Extra Mechanical Parts - Just a Card, One Clever Gimmick and Pure Genius
Everything is examinable at the end - Learning Process: 60 Seconds
Shortest Installation Time Ever: 4 Seconds Reset