PowerBuilder provides built-in system objects you can use in client/server, multitier, and Web applications. You can also build both visual and nonvisual user-defined objects. One type of nonvisual user-defined object, the custom class user object, inherits directly from the PowerBuilder NonVisualObject system class. Objects of this type, often called simply NVOs, can be deployed to J2EE-compliant application servers as EJB components and EJB 2.1 Web services. The server plug-in must be installed and configured on the application server.
