[Zope] multiple zopes with apache

Hi, I just setup apache 2 on windows on port 80 Now I want it to proxy a few zope instances. I setup zope to run on 8080 and all is well. I have an apache subfolder proxying the instance of zope. Question is, what is the best way to add addtional zope versions? Should I just run them with another port number? I assume that the apache server will hand everything off as 80 so I could choose something like 8081 for my second zope instance with no problems right? Is this how its normally done or is there another way?