The .JNLP file used with this application illustrates how it’s possible for signed code to execute outside the default sandbox environment provided by Java Web Start.

Since JNLP files are simply Java Web Start files that open applications through an Internet browser, any browser that works in Windows 8.1 will open a JNLP file as long as you have Java installed.

Java Web Start simplifies deployment of applications, but Sun's Plug-in makes the task even easier. See how the Java Plug-in from Sun enables browsers to fetch a Java Virtual Machine (JVM).

Web Start applications are regular Java applications that are written to the JNLP specification; but there are differences you'll want to know before you head down the JNLP path.