OK solved - sorry for stupid question.
It’s a very useful feature - great work Mark!
example: (tested with Ditto1.1 beta)
I’m working on an Italian real estate web site
I have two category tv ’’riferimento’’ (rent, sale, vacations...) and ’’provincia’’ (rome, naples, florence...)
Now i can create a link from the display chunk of Ditto to a page that meet only this criteria:
i hope the code explain better than my english

:
<div id="listAnnunci">
<h3><a href="[~[+id+]~]">[+title+]</a></h3>
<div id="rightscheda"><a href="[(site_url)]annunci.html?tags=[+tvriferimento+]">[+tvriferimento+]</a> <span class="provincia"><a href="[(site_url)]annunci.html?tags=[+tvprovincia+]">[+tvprovincia+]</a></span></div>
<br />
<br style="clear:both;height:1px;margin-top: -1px;line-height:1px;font-size:1px;" />
</div>
again great work Mark!