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These functions provide the ability to shrink and grow the heap, as well as,
find heap related problems.  The following functions are defined:

_heapchk
    perform consistency check on the heap

_bheapchk (see _heapchk)
    perform consistency check on a based heap

_fheapchk (see _heapchk)
    perform consistency check on the far heap

_nheapchk (see _heapchk)
    perform consistency check on the near heap

_heapgrow
    grow the heap

_fheapgrow (see _heapgrow)
    grow the far heap

_nheapgrow (see _heapgrow)
    grow the near heap up to its limit of 64K

_heapmin
    shrink the heap as small as possible

_bheapmin (see _heapmin)
    shrink a based heap as small as possible

_fheapmin (see _heapmin)
    shrink the far heap as small as possible

_nheapmin (see _heapmin)
    shrink the near heap as small as possible

_heapset
    fill unallocated sections of heap with pattern

_bheapset (see _heapset)
    fill unallocated sections of based heap with pattern

_fheapset (see _heapset)
    fill unallocated sections of far heap with pattern

_nheapset (see _heapset)
    fill unallocated sections of near heap with pattern

_heapshrink
    shrink the heap as small as possible

_fheapshrink (see _heapshrink)
    shrink the far heap as small as possible

_bheapshrink (see _heapshrink)
    shrink a based heap as small as possible

_nheapshrink (see _heapshrink)
    shrink the near heap as small as possible

_heapwalk
    walk through each entry in the heap

_bheapwalk (see _heapwalk)
    walk through each entry in a based heap

_fheapwalk (see _heapwalk)
    walk through each entry in the far heap

_nheapwalk (see _heapwalk)
    walk through each entry in the near heap