lsof information

Can anyone point me to some clearly written explanations of the output of
lsof? Man lsof gives ather densely worded pages that presume more
background knowledge than I have. Just dicking around here with a
Mandriva 2006 install, and doing lsof with no parameters produced a huge
list. I read disturbing things in there like "unknown protocol" and
"heap: unknown file or directory".
any clues happily taken
.

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