How does mmap work?

Hello,

I assume mmap just gives me a pointer to the actual memory location of a
file, since files are all in memory anyway.  Is that correct?  So, I should
be able to access files with zero memory usage and copying right (unless its
on a card, of course), right?

--Scott Thibault
AcroDesign Technologies
http://www.acrodesigntech.com