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In the flat memory model, the application's code and data must total less
than 4GB in size.  Segment registers CS, DS, SS and ES point to the same
linear address space (this does not imply that the segment registers contain
the same value).  That is, a given offset in one segment refers to the same
memory location as that offset in another segment.  Essentially, a flat
model operates as if there were no segments.