[Zope] integrating a zope app with plone security, search

Does anyone know a good resource (link) that describes integrating a zope application into plone? I have a zope application (dtml, scripts, external methodss, etc.) that I want to package for distribution with plone 3.x. I also want to import the zexp under the plone folder and have all the plone users have access to this application. However, I don't want to turn this application into a plone app. At some sites, it will run much faster without plone. Thanks for the help. googling has been fruitless so far. Tim