clarification of my understanding of tomcat

[Mike Haberman]

Can someone tell me if it's possible to mix web applications
that have been build with different jdks than what jvm tomcat
runs under?

 Can tomcat run under jvm 1.1.x and serve up jdk1.2 apps? 
 Can tomcat run under jvm 1.2 and serve up jdk1.1.x apps? 

 What is the recommended jvm to use with tomcat?

 I just installed 3.1 under freebsd.  Seems to work under 1.1.8
 but not 1.2.


 Thanks to those who can clarify this for me.