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PATH (September 1999)(Disk 2).iso/Technical Publications/macos8/images/space.gif){kind=small} Mac OS 8 Developer Documentation
> Human Interface Toolbox
> Control Manager
>
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Programming With the Mac OS 8.5 Control Manager
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Reports whether a given handle is a control handle.
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pascal Boolean IsValidControlHandle (
ControlHandle theControl);
The IsValidControlHandle function confirms whether a given handle is a valid control handle, but it does not check the validity of the data contained in the control itself.