Launch multiple WS apps from a local Java application?

I should develop a local Java application that on demand launches webstart applications. Obviously it could be done with a simple HTML file, but the requirements are that launched apps be monitored by the launching app, so they need to be in the same JVM.
I tried
java -Djnlpx.home="C:/programfilesdir/Java Web Start"
-classpath ".;..\classes;..\lib;..\lib\javaws.jar" Launcher
Then Launcher.java calls com.sun.javaws.Main's main method passing the JNLP URL as a parameter.
This launches Java Web Start and then the child app, but for some reason I ignore the Launcher app is exited without exceptions as soon as javaws starts.
Provided that the Java WS app manager is itself a Java app that launches WS app's, any clue on how to do the same thing? Or can the source code be inspected?
Thanks.

I should develop a local Java application that on
demand launches webstart applications. Obviously it
could be done with a simple HTML file, but the
requirements are that launched apps be monitored by
the launching app, so they need to be in the same
JVM.You might check out netx, a open-source JNLP client that has extra support for running multiple apps in a single JVM. It includes a SecurityManager that can catch System.exit and close the calling app's windows and resources (applet sounds, etc) instead of closing the JVM. It has other support too like separate look and feels for each app.
It doesn't yet implement all of the spec though, but it does run most JNLP apps.
http://jnlp.sourceforge.net/netx/

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