The best resolution at present is 800x600 pixels, so the stage is big enough and is able to be viewed on most screens, because most people are using at least a 17 inch monitor. You also can change the backgroundcolor. The Cast Director works like a film, so there are many terms that are used from film. In the cast the actors take place. Everything, director is working with, can be a actor.
Every actor can take part on the stage at various times and at various length.
The film can played with a various number of frames. The lenght of the film is unlimited. In the cast the actors are laying over each other in a way called sprites. But only the sprite with the highest number is visible. In this channel, there are many effects to switch between two frames.