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─────Run-Time Library───────────────────────────────────────────────────────
 
     The _heapadd and _bheapadd functions add an unused area of memory
     to the heap. The _bheapadd function adds the memory to the
     specified based heap <seg>. The <size> argument specifies the size
     of the memory to add and must be an even number. The _heapadd
     function looks at the segment value and, if it is DGROUP, adds the
     memory to the near heap. Otherwise, _heapadd adds the memory to
     the far heap.
 
     Return Value
 
     These functions return 0 if successful, or -1 if an error occurs.
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