Michael Fox:
> 1)      How can I tell which result values can be used in any given lookup
> table?

What is a valid result depends on what the result is used for: an
access table expects results as described in the access(5) manpage,
a virtual aliases table expects  the results as described in the
virtual(5) manpage, a transport table expects results as described
in the transport(5) manpage, a the local aliases table expects
results as described in the aliases(5) manpage. You get the idea.

> 2)      Is there a difference between "OK" and "permit"?  If so, what?
> 3)      When can/should text follow the "reject"

Those things are described in the access(5) manpage.

> 4)      Does "dunno" work the same as described in
> http://www.postfix.org/access.5.html

Yes, when used in an access table. As documented, "dunno" has no
special meaning in virtual(5) or transport(5) or aliases(5).

> 5)      More generally, for any given table, how would I determine which
> result values are allowed and what they will do?

What is a valid result depends on what it is used for: an access 
table expects results as described in the access(5) manpage, and so
on, as enumerated under my reply toi 1).

        Wietse

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