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A property of the SYSTEM built-in variable that sets the override procedure for the OPEN(Window) internal Clarion procedure. Equivalent to {PROP:LibHook,19}. Assign the ADDRESS of the overriding procedure, and the runtime library will call the overriding procedure instead of the default OPEN procedure. Assign zero and the runtime library will once again call its internal procedure. The overriding procedure's prototype must be exactly the same as the OPEN procedure found in the BUILTINS.CLW. (WRITE-ONLY)