# RBNB V2 Installation Notes

If you have downloaded a version with a bundled JVM, it is located in a "jre" subdirectory off of the installation root directory. This version will be used to run the webserver and its child processes.* If a JVM has not been installed, one will be found according to the following:

1. The JAVA_HOME environment variable, if set. (* This will override the installed JVM, also).
2. A JRE which is installed with its root as "InstallDir/jre".
3. In Windows, the contents of the Registry, specifically the keys:
``

`HKEY_LOCAL_MACHINE\SOFTWARE\JavaSoft\Java Runtime Environment\CurrentVersin\JavaHome`

and

`HKEY_LOCAL_MACHINE\SOFTWARE\JavaSoft\Java Development Kit\CurrentVersion\JavaHome`

The Jakarta-Tomcat Web Server (which provides the Web interface for the RBNB system) requires a full JDK, rather than a JRE, installation on Unix machines.