The stand alone (SeisGram2K) version of SeisGram2K is launched from the command line on a local system. It requires the latest version of Java (http://www.java.com), and that SeisGram2K<version>.jar or the path to the SeisGram2K classes is included in the CLASSPATH environment variable or in the -cp switch to the java command. For more information, consult the Java documentation or the SeisGram2K installation documentation (http://www.alomax.net/seisgram -> Download and Installation).
The applet (SeisGram2KApp) version of SeisGram2K is launched from an HTML web page in any recent browser that has Java enabled, and requires the latest version of Java (http://www.java.com) on your system. Consult the SeisGram2K installation documentation (http://www.alomax.net/seisgram) for information on installing and configuring SeisGram2KApp on a web server.