[Xitami] firewall access for multiple servers

[Michael Bronder]

perhaps slightly off topic, but as I'm trying to avoid taking Xitami offline
I thought I'd ask:

I'm interested in running Xitami, IIS and perhaps Apache for educational and
light practical purposes.  I'm wondering if I were to set each up on its own
machine behind my firewall, and open a differect port to access each one,
how that would work with my DNS and URLs.... Would every URL for a server
NOT on port 80 need to have the ".com:port#" appended to it, or is that
something I could set up with the DNS... (akin to "forward all www.blah.com
requests to 111.111.111.111:1080, all www.blahblah.com to
111.111.111.111:2080).

If I were not to register 3 domain names, would the port stay open after the
first "111.111.111.111:1080" call, or if I were to follow a relative link
from that index page, say, to a prduct page on the same site, would my
browser stay on the same port?

Does the question make sense?

Would keeping IIS on a port other then 80 make it less likely to be hit by
the 20K of hack attacks I get in the Xitami logs every day?  All I'm
interested in doing with IIS is learning more about ASP as well as perhaps
throwing up some quick "MS Access web data sheets"

Thanks for any help, and again, sorry if off topic.

Michael