I'm going to take this a different direction. If you're worried about a limit, your design is wrong. OOP says that objects should be encapsulated and keep their own data. If you have that many properties of _SCREEN, you have far too many things that are visible to everything.

>I use a lot of _screen.xxxxx variables in my program.
>
>is there any limit of _screen.xxxxx I can have?
>
>Jerry