Answer to first question: Yes you can have two , in fact more than two JVM in the same machine (Vertical Clustering involves this..)
Answer to second question : Yes, but dont know why should be there a need !!
SCJP5 -
To repeat what others have said, requires education, to challenge it , requires brains.
Having two JVM instances running on the same computer is very simple: just run two Java programs at the same time, and you have two instances of the JVM running.
