[Zope] Zope port and provider

Hi all a friend of mine fired this question at me can someone help me give him a awnser? "There appears to be a serious flaw with zope: one needs a zope provider. and there aren't too many. apparently zope grabs port 80 and keeps it. is this true? are there workarounds so that any isp will do?" I know there are quite a few Providers. Hope someone can help me. Greetz, Jamez