I am running Jboss 4.0.1sp1 with the 1.4.2_10 JVM on a Windows 2003
Server with 5GB RAM. I'd like to run multiple instances of Jboss,
giving each 2GB available RAM to work with leaving the remaining 1GB
for the OS.

I've scoured the internet for this and can't find any helpful
information.  Is there any way for the JVM to display the default
maximum heap size on a system?  I can't seem to figure out what it is
using as its maximum value, if I don't manually override it with -Xmx.

as in title
any links, docs, contacts
regards
Martin