Futurebasic/Language/Reference/validrect

Syntax
ignored = FN VALIDRECT(rect)

Revised
February, 2002 (Release 6)

Description
Before Carbon became a part of the Mac toolbox, we were able to use a toolbox procedure called VALIDRECT to mark a portion of the current window as an area that did not need to be refreshed during the next update. This call will not work in OS X (or in the Carbon version of OS 9). Our substitute,, will work in versions 7 through X without additional coding required on your part.