1.   The VDU interface exploits the full screen display techniques possible with the VDU, so that all interaction takes place via a series of display pages.

2.   The first response is a single line prompt on the current display page.

3.   All interaction with LIFESPAN is carried out via display pages.

4.   Together, Indexes and display pages make up the LIFESPAN User Interface which covers all LIFESPAN activities.

5.   Normally, the first step in any process is to select an option from an index page, and thereafter to request or provide information on display pages.

6.   Mail messages are accumulated for each user and the number of currently held messages is shown at the top of each display page.

7.   A display page which allows the user to select from a set of previously input values.

8.   All LIFESPAN user interaction takes place via a series of display pages on a terminal.

9.   The location within a display page on which a single item of information is displayed or input.

10.   A display page containing a list of options from which one may be selected.