INF: Heap Placement in Memory
ID Number:  Q12245

2.00 3.00
WINDOWS


Summary:

The Windows system uses LocalInit(ds,0,size_in_bytes) to align the
heap. The first 16 bytes in DS are the NULL segment. It contains a
block of "reserved pointers." These are the heap pointers. The heap is
located in DS by subtracting the size of the heap from the end of
DGROUP and filling in the start of the heap pointer with the resulting
offset from the end of DGROUP. This procedure avoids data-stack/heap
collision.
