Terminology

This section describes the terminology used throughout this book.

applet: A program written in Java that is referenced in an HTML file. An applet is launched by a Java Virtual Machine (JVM) running in a Web browser.
application: A program or suite of programs that perform a task or specific function.
cached client: A Host On-Demand cached client is any Host On-Demand client whose components have been cached (stored locally for quick access) on the hard disk of a user's workstation.
default publish directory: The default publish directory is the subdirectory HOD in your Host On-Demand server's install directory, for example, c:\Program Files\IBM\Host On-Demand\HOD\ on Windows platforms and /opt/IBM/Host On-Demand/HOD on AIX, Linux, Solaris, /QIBM/Programs/IBM/Host On-Demand/HODon i(as/400), and /usr/lpp/HOD/Host On-Demand/HOD on z/OS platforms.
download client: Download clients download the necessary applet files each time users access the HTML files. Download clients are generally used in LAN-connected environments because high-speed network connections reduce the time it takes to download them from the Web server.
emulator client: An emulator client is a Host On-Demand client that launches a terminal emulator session. Host On-Demand includes the following emulator clients: cached client, Web Start client, and download client.
separate user publish directory: Provides a separate writeable location for deploying custom HTML files, isolating them from the files provided by Host On-Demand. This keeps the Host On-Demand publish directory read-only and makes it easier to apply future Host On-Demand upgrades.
Note:
Other user-modified files (such as custom applets and HACL programs) still need to run from the Host On-Demand publish directory.
Web Application Server: The run time for dynamic Web applications. Web application server includes support for Java servlets, JavaServer Pages (JSP), and other enterprise Java application programming interfaces (APIs). A Web application server provides communications, resource management, security, transaction management, and persistence capabilities for Web applications. It also typically includes an administration interface for managing the server and deployed applications.
Web server: A server on the Web that serves requests for HTTP documents. A Web server controls the flow of transactions to and from the browser. It protects the confidentiality of customer transactions and ensures that the user's identity is securely transmitted to the server.
Web Start client: The Web Start client allows users to run Host On-Demand sessions without a browser. Users start Host On-Demand sessions from the Java Web Start Application Manager.