Hi Nathan,
By "Portal" you mean "the floating box on the right which shows a bunch of
interesting links in a fashioned way, added only with the small code
{{Platonism}} ?" I never tried but this is how I would do it :
you can try to create the portal page which only shows a floating box with
the macros #startfloatingbox() & #endfloatingbox(), or simply
#floatingbox("Some content"). Then, create the target page and write the
macro #includeForm("Space.Name") to insert the portal.
Does it work? Is that what you asked for?
Cheers,
Sebastien Fieux