Lists all system properties and their values, then all environment variables and their values. When run as a WebStart the system properties are restricted and a default list of properties (documented in the API Java docs for java.lang.system.getProperties) is used instead. However, most of those properties, and all environment variables, are restricted from viewing when run using WebStart. To see them, download the runnable Jar file.
Download ShowProps.jar (executable Jar file).
Run ShowProps.jar via WebStart. (View ShowProps.jnlp.)