Table 1. Resources: type and associated services. the Whiteboard Manager controller allows to handle previously saved screens and capture new ones; the Text and Slide Editor controllers provide access to widely used text and slide operations, respectively; and the Internet Browser allows to navigate among websites. These services can be accessed through a common communication service called message handler that parses the incoming request and passes the control flow to the appropriate service. Figure 4. Task-oriented PDA interfaces. The System window provides access to common application tasks (left). The Navigation window shows popular navigation commands for slide control (right).
