Thanks all for the help.
To summarize for the benefit of those who find this thread later:
A style of 'unnumbered does the trick. Thus
@section[#:style 'unnumbered]{My Section}
will list it without giving it a number.
As for avoiding duplicate tags, this doesn't appear to be quite right:
> If you go the latter route, you'll also need to use `#:tag-prefix` in a
> cross-reference to a subsection (if you have any besides "Handin
> Instructions") in one of the N sections.
>
It appears that the actual keyword argument is #:tag-prefixes [note extra
"es"], and it takes a list of tags.
Thus, with only one prefix, a source document with
@section[#:tag "uniq" #:tag-prefix "uniq"]{My Section}
can be referenced as
(secref #:tag-prefixes (list "uniq") "uniq")
[But of course there's no reason for the tag and the tag-prefix to be the
same string.]
And of course you can combine these:
@section[#:style 'unnumbered #:tag "uniq" #:tag-prefix "uniq"]{My Section}
Shriram
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