HP 3000 Manuals

High-Level Screen Management Intrinsic Library (Hi-Li) Reference Manual

The High-Level Screen Management Intrinsic Library 

The High-Level Screen Management Intrinsic Library (Hi-Li) comprises a
number of callable procedures that link your application to HP's screen
management facility.  The screen management facility controls the
transfer of information between an application and the screen at run time
by providing an interface with the system-level input and output (I/O)
operations.  Figure 1-1 illustrates the relationship between Hi-Li, the
application, and the terminal with its I/O operations.


          Figure 1-1.  Hi-Li and the Screen Management Facility 

Each intrinsic performs several system-level functions.  This allows you
to keep your application design simple and reduces code maintenance
resulting from system-level changes.  As the screen management facility
handles system-level details, you can concentrate on the actual functions
your application needs to perform instead of the requirements for
implementing those functions.

Part of the screen management facility is the FORMSPEC/V utility, with
which you can design interactive user interfaces called "forms".  Hi-Li
intrinsics act as an interface between the application, the terminal and
the forms, controlling the transfer of data to and from the terminal.
You can use Hi-Li intrinsics to manage the display of forms on a terminal
screen and the entry, collection, and validation of data via these forms.
Figure 1-2 shows the flow of data from point to point.


          Figure 1-2.  Hi-Li and the Transfer of Data 

MPE/iX 5.0 Documentation