This paragraph isn't clear:
> If the allow file exists, then you must be listed therein in order to be
> allowed to use this command. If the allow file does not exist but the
> deny file does exist, then you must not be listed in the deny file in
> order to use this command. If neither of these files exists, then
> depending on site-dependent configuration parameters, only the super user
> will be allowed to use this command, or all users will be able to use
> this command.
"If neither of these files exists, then depending on site-dependent configuration parameters" -- which site-dependent parameters are these? This needs to be explained such that it becomes clear what does it depend on.
Additionally, "allow" and "deny" files need to be explained. What are the paths and format?