I haven't really had any time to look at the new manual, but I'm pretty sure...
&tablename.fieldname-opt== means that the value (i.e.
xxx) specified in &tablename.fieldname=
xxx (which should also be specified in the url) must be
exactly equal to
xxx (and not, say, like, >, or <
xxx).
&d=1 could mean a number of things, but odds are in this context it is being used to signify that the search_results template should display a single
detailed record, rather than loop through all the listings (which would presumably be only one, because of the &tablename.fieldname-opt== already specified)
If I'm right about that, to get the &d=1 to display the detailed result, you'd put in your template:
<%if d = 1%>
detailed result.....
<%else%>
<%loop%>
short result.....
<%end loop%>
<%endif%>
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