javac The Java compiler. Converts Java source code into bytecodes. java The Java interpreter. Executes Java application bytecodes directly from class files. appletviewer A Java interpreter that executes Java applet classes hosted by HTML files. javadoc Creates HTML documentation based on Java source code and the comments it contains. rmic Creates class files that support Remote Method Invocation (RMI). rmiregistry Registry used to gain access to RMI objects on a specific machine. rmid Activation system daemon for RMI object registration and activation. native2ascii Special program used to convert between standard Latin-1 Unicode characters and other international encoding schemes. jar Java Archive (JAR) file generator. JAR files allow multiple Java classes and resources to be distributed in one compressed file. keytool Used for security key generation and management. jarsigner Implements digital signing of JAR and class files. Allows applets to be certified by trusted authorities. policytool Allows user-installation-level security policy configuration.