High-Level Screen Management Intrinsic Library Reference Manual (32424-90002)

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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 func-
tions
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.