System Requirements The main requirement is that your browser is running an up-to-date version of the Java plug-in — at least version 6. This can be installed from www.java.com For anyone unfamiliar with Java, this is like updating your Flash plug-in, and is a perfectly safe procedure. The Super-Efficient Applet runs in a browser window without requiring access to your local file system, and so does not require you to accept a digital software signature.