[Zope] VirtualHostMonster and multiple domains

[notices]

Hi. I have concerns about virtual hosting. 
Today, I have a single zope instance with a single IP number and a single application in a 
folder called /lngate. No Apache, just ZServer. So far I have been testing it with the IP 
number x.x.x.x/lngate  . I just set up a virtual host monster with the mapping 
www.lngate.com/lngate
So hopefully tomorrow, when we start changing www.lngate.com to point to this new IP number, 
the requests will be forwarded to the lngate folder.  
Do I have to do anything to my Catalogs? 
I don't need Squid, do I? This will be a low traffic site, with very small pages.

Also, my network guys, who usually work in IIS, are telling me that when the second 
application is ready, it will need a separate IP number. And that this application should be 
in the root folder of the site. Is that right, or can I just use another domain with the same IP?
I would add another line to the Virtual Host Monster, and have the second application in a 
second folder. That's the way I interpret the virtual host monster documentation. Has anybody 
done this? Thanks for your help,
Annie