IsFreeHandle traverses the application’s global list of free handles and returns TRUE if it finds the specified handle in the list.
The h parameter specifies the handle to be found.
MacApp calls IsFreeHandle in debugging versions of applications from certain global routines. For example, MacApp calls IsFreeHandle from InspectObject and from ShowFields; it also calls IsFreeHandle when it dtermines whether a handle is an object reference. You usually do not need to call IsFreeHandle yourself.