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─────The INQFOCUSQQ Function────────────────────────────────────────────────
 
     The INQFOCUSQQ function sets its argument to the unit number of
     the window that currently has focus:
 
          dummy = INQFOCUSQQ(activeWindow)
 
     The function returns zero on success and a nonzero value on
     failure. It fails if the window with focus is associated with a
     closed unit.
 
     The interface for INQFOCUSQQ, defined in FLIB.FI, is
 
          INTERFACE TO INTEGER*2 FUNCTION INQFOCUSQQ(IUNIT)
          INTEGER*2 IUNIT
          END
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