[KLUG Members] Java Complexity

[Eric Beversluis]

I'm trying to sort out Java Virtual Machine, Jave Runtime Environment, JDK,
and Java PlugIn.

JVM, as I understand it, is the program that lets the same Java code run in
any OS--so each OS (Windows, Linux, Mac) has a JVM built in.

What then is Java Runtime Environment? How does JVM relate to JRE? Do they
overlap? Are they total distinct things? 

Is there any overlap between the foregoing and JDK?

Where does Java PlugIn fit in all this?

Eric Beversluis