mmap(2)

[pefv700 at perv.pe.utexas.edu]

I'm trying to understand how to use mmap(2) by RTM and am stumped.
Of course, the whole concept here is probably escaping me (read the header,
I'm no CS major).

So does anyone have a short and sweet cat(1)-like example that will
broaden my system call knowledge (at least a little)?

Chris