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The following are some typical ways in which HLLAPI application programs can be used:
You can write a HLLAPI application that supplies the necessary keystrokes to log on to a 3270 host, start the required host application, and perform any standard initial procedures. This can be used to automate access to frequently-used host applications. For an example of this, see the sample program described in Sample HLLAPI Program.
HLLAPI applications can be used to request data from a user and then to transfer this data to a host 3270 application. This can be used, for example, to restrict users to a subset of the functions of the host application, or to provide an easy-to-use menu interface for an old line-by-line host application.
The 3270 emulation program supports four different 3270 screen models-the
standard 24 x 80 screen and three larger screen sizes. Your Solaris computer
may not be able to display all of these screen models, depending on the screen
hardware and terminfo database information; this means that, although a session
can be activated, you cannot access it directly using the 3270 emulation program.
However, you can still access 3270 sessions that use these screen models by
using HLLAPI to communicate with the 3270 session. For example, you can write
a HLLAPI application that provides a window
on the 3270 presentation
space by displaying a copy of part of the presentation space, enabling the
user to type information into it, and then transferring this information to
the presentation space. This enables you to access host applications that
depend on larger screen models, even on terminals that cannot display the
screen model required.
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