Normally when using Mozilla, Mozilla Firefox or Internet Explorer on Windows your browser should have been setup for you already. However, when the demo does not appear your browser may need to be (re-)configured to use Java Web Start.
For most browsers this is done by setting up the preferences. In the browser's preferences menu this may be called ``File Associations'' or ``Helper Applications'', or something similar. The general idea is that files with the extension .jnlp (Java Web Start application descriptors) should be handled by the Java Application Cache Viewer, which is started by the binary javaws .
Assuming you are on Linux and have chosen the installation path
/usr/java/jre1.6.0_05/javaws/
/usr/java/jre1.6.0_05/javaws/javaws.exe %1
The following browser configuration setting may be needed to indicate that .jnlp files should be invoked using the helper application ``javaws''.
MIME type application/x-java-jnlp-file Description JNLP File (Java Web Start) Extension jnlp Application javaws
Note that if you have installed JRE 6.0 yourself in your own space then the binaries for it may not be in your path. In this case you will need to specify the full path in the browser configuration in place of just the name ``javaws''. You will normally find it under the jre directory, for instance something like:
...somedirectory.../jre1.6.0_05/jre/javaws/javawsor
...somedirectory.../jre1.6.0_05/javaws/javaws
Java Web Start may also ask about your ``proxy''. This has to do with how you are connected to the Internet. It is likely that you will simply be able to hit ``OK'' and carry on. If you encounter problems and do not understand proxies then you may need to get your local IT support to help with this setting.
The solution is to go into the X11 preferences, then tab 'Pasteboard', then uncheck 'Update Pasteboard when CLIPBOARD changes', then restart X11.