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A property of the SYSTEM built-in variable that allows a procedure to be set up to automatically initialize the TIE values the first time an ASTRING representing a particular value is assigned. Equivalent to {PROP:LibHook,14}. Assign the ADDRESS of the InitAString procedure, and the runtime library will call this procedure when an ASTRING variable is first assigned. Assign zero and the runtime library will stop calling the InitAString procedure. (WRITE-ONLY)