This function will allocate a block of memory from the DOS free memory pool.
It returns both the real mode segment and one or more descriptors that can
be used by protected mode applications to access the block.
Declaration:
function AllocDOSmemoryBlock(SizeInBytes: DWord): DWord;
Remarks:
Returns paragraph-segment value in its high-order word and a selector in
its low-order word if successful. Otherwise returns zero.