Futurebasic/Language/Reference/autoclip

Statement
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Syntax
autoclip [=] booleanExpr

Description
If  evaluates as "false" (zero), this statement turns off the "autoclip" flag for the current output window. If  evaluates as "true" (nonzero), this statement turns on the "autoclip" flag for the current output window, unless the window was created with the   attribute.

If a window's autoclip flag is "on," things like buttons, edit fields and picture fields are excluded from the window's "clipping region." This exclusion means that such object are "protected"—drawing commands won't draw over such areas, and the  command won't erase them. While leaving autoclip "on" is normally a good idea, it can slow down the execution of drawing commands, especially on older Macs.

Any FB window will have its autoclip flag "on" at the time it's created, unless the  attribute is set in the   statement that creates it.