hab (HAB) - input

      Anchor-block handle.

    prclprc (PRECTL) - input

      Rectangle to be checked.

      Note: The value of each field in this structure must be in the range -32 768 through 32 767. The data type WRECT can also be used, if supported by the language.

    rc (BOOL) - returns

      Empty indicator.

      TRUE

        Rectangle is empty
      FALSE
        Rectangle is not empty.

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