Concurrent running different Tomcat versions

[Mark Muffett]

Can I run Tomcat v3.3 & v4.0 concurrently on the same box? (Linux OS)?  It
would be useful for testing, but I'd like to know if there's something
obvious that will make it go wrong before I start.

If so, could I use them both in conjunction with Apache (with mod-webapp for
v4.)?

Thanks for any help.

Mark