IBM® Telephone Directory V5.2 contains a Web application packaged in an Enterprise Archive (.ear) file that is deployed into a WebSphere® Application Server run time environment.
Once the application is deployed, it handles requests routed to it through the application server. The application server can provide various access paths and have various security features enabled for the server as a whole or specifically for the application. Requests must pass through the server to be routed to and handled by the IBM Telephone Directory V5.2 application. Once requests reach the application, the application handles the required LDAP interactions, and, optionally, configured Enterprise Identity Mapping (EIM) or Sametime® operations.
The application is written and packaged to Java™ standards. WebSphere Application Server provides the runtime environment for the application, which includes support for Java runtime APIs. The following describes what the application uses:
- For WebSphere Application Server V5, standard Java runtime environment APIs (J2SE version 1.3) are provided. J2SE 1.3 provides basic Java utility functions, context, and socket factories used to communicate with LDAP servers, and Java locale support for internationalization.
- For WebSphere Application Server V5.1 and V6, standard Java runtime environment APIs (J2SE version 1.4) are provided. J2SE 1.4 provides basic Java utility functions, context, and socket factories used to communicate with LDAP servers, and Java locale support for internationalization.
- Enterprise application runtime environment APIs (J2EE version 1.3), which provide Web application support for HTTP servlets (HTTP Servlet Specification Level 2.3) and Java Server Pages (JSP Specification Level 1.2).
- Web application deployment utilities (J2EE version 1.3), which provide deployment of the application using Enterprise Archive (.ear) files, Web Archive (.war) files, and Java Archive (.jar) files.
See the following Web site for more details on the application deployment environment and Web application packaging tools and services:
WebSphere Application Server 
(http://www.ibm.com/servers/eserver/iseries/software/websphere/wsappserver).