[plt-scheme] auto doc generation

Hi all,

Is there a system in use with plt for documenting functions automatically
from C/C++ comments in a module extension? (Like a doxygen for generating
plt docs).

Also, is there a standard way of using online help from the repl? ie a
(help funcname) which would return information and examples as text of a
specified function.

I'm happy rolling my own, I'd just rather use a standard if possible.

cheers,

dave