High-Level Language Application Programing Interface - A programming interface that usually operates in conjunction with an emulator, like BlueZone, that allows interaction between a host and a remote application program.

See High-Level Language Application Program Interface.

High-Level Language Application Programming Interface. An API within all of IBM’s 3270 terminal emulators that allows other programs to call the API to create 3270 format input and interpret 3270 output.