Question about the DiscoveryListener Interface example in tutorial

Hi,

I have a few questions about the DiscoveryListener Interface example
in tutorial:

http://www.jxta.org/project/www/Tutorials.html

How to Launch JXTA from an Application & Use the DiscoveryListener Interface

1. Can the discovery client and server run in different subnet?

2. Is there any dependency between the order which client and server
start? I.e. does the server has to run first before the client can be
discovered?

3. What about failover situation?  After the server discovers the
client,  and if the server goes down, will the server re-discovery the
client again after the server comes up?

4. Can I run the discover client/server within a web app running on
top of tomcat?

Thank you.