High-Level Language Application Programming Interface
4-1
Chapter 4. High-Level Language Application
Programming Interface
The Host Connection Program (HCON) emulates a 3278/79 display or a 3286/87 printer
attached to a System/370 mainframe host. This chapter provides information for using the
High-Level Language Application Programming Interface (HLLAPI) and HLLAPI functions to
provide an interface to the Host Connection Program.
Programming HLLAPI
The High-Level Language Application Programming Interface (HLLAPI) is an application
programming interface (API) supported by the AIX 3270 Host Connection Program
(HCON). This interface enables a program on a workstation to access a host presentation
space. A host presentation space is a region in computer memory that can be displayed on
the screen of a 3270 terminal emulator.
Consult the following for more information about HLLAPI:
• HLLAPI for AIX 3270 Host Connection
• Programming with HLLAPI (on page 4-7)
• HLLAPI Functions by Function Number (on page 4-9).
HLLAPI for AIX 3270 Host Connection
The High-Level Language Application Programming Interface is an API supported by
HCON. This interface allows workstations to interact with a host using 3270 terminal
emulation. Consult the following for more information about the High-Level Language
Application Programming Interface:
• HLLAPI Execution Environment on page 4-1.
• HLLAPI Components on page 4-3.
• Uses of HLLAPI on page 4-4.
• HLLAPI Services on page 4-4.
• HLLAPI Connections on page 4-5.
• HLLAPI Presentation Spaces on page 4-5.
• Printer Sessions on page 4-5.
• Running HLLAPI Programs on page 4-5.
• HLLAPI Current Connection on page 4-5.
• Keyboard Remap with Utility Session on page 4-6.
• Ending HLLAPI Communication on page 4-6.
HLLAPI Execution Environment
The HLLAPI application executes in a process environment. When you run the HLLAPI
application, the following processes are generated:
Name Description
hcondmn Daemon process
e789x Emulator child process for each session as initiated by the HLLAPI
program
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