Nothing I can find on the web that describes virtual memory systems mentions such a limitation. Almost everything I can find implies that my description of virtual memory is accurate, at least for paged systems (and most of the systems commonly in use are paged). Some of the following links may be of interest:

Perl is environmentally friendly - it saves trees

In reply to Re^5: Reading huge file content by GrandFather
in thread Reading huge file content by siva kumar

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