Migrating from EHLLAPI

Applications currently written to the Emulator High Level Language API (EHLLAPI) can be modified to use the Host Access Class Library. In general it requires significant source code changes or application restructuring to migrate from EHLLAPI to HACL. HACL presents a different programming model than EHLLAPI and in general requires a different application structure to be effective.

The following sections will help a programmer familiar with EHLLAPI understand how HACL is similar and how HACL is different than EHLLAPI. Using this information you can understand how a particular application can be modified to use the HACL.