How do I associate a web app with a specific IP (connector)?

[Barnet Wagman]

I'm going to be running Tomcat with two IP addresses (each has its own 
domain name).  How do I associate some web apps with one and some with 
the other?

From my reading of the /Server Configuration Reference/ (but no 
experience yet), I gather that I should create a connector for each IP 
address.  But I don't see how to associate a web app with a particular 
connector.  Do I need to create separate Host elements and use separate 
appBases? Or is there another way altogether?

Thanks,
bw