The ESL Development System provides the following files that are required for developing your local application:

LOCALAPP.H is a C header file that you must include at the beginning of any module in your local application that calls functions defined by the LOCALAPP.LIB object library.

The LOCALAPP.LIB object library provide necessary services for your local application.  These services allow it to communicate with ESL, temporarily suspend execution, and exit.  You must link this library with your local application.