Heap32First

Anyone have any experience with any of the Heap api functions?

Why are you messing with heap management in VB?
Most of the heap api functions are there in direct counterpart to C calls:
malloc()
calloc()
free()
realloc()

HeapWalk is the only one that isn't a direct C call. If you want to do this kind of thing you should be in C, not VB. No offense, but this makes almost no sense to try in VB. IF you're doing some kind of internals thing, use C++.