[Zope] Newbie method rendering question

[Larry Albert]

I would like to include the contents of a Squishdot site, which is at
/squish/index_html, within a DTML method at /Squishmirror. In Squishmirror
if I use

<dtml-with squish>
   <dtml-var "index_html()">
</dtml-with>

it gives me an error, seemingly in the process of rendering /index_html
(not the /squish/index_html that I want.) If I instead try

<dtml-with squish>
   <dtml-var "squish.index_html()">
</dtml-with>

it gives me an error because it can't render the first siteheader variable
within /squish.index_html.

Is it not possible to render a product from a different location? Or am I
just getting the calling syntax wrong? (Or both?)

Thanks for any help,

Larry Albert
lda@rice.edu