Each library has a corresponding include file that you must reference in your ESL program before you can invoke any of that library's functions or subroutines. Some of the libraries have optional include files, that provide extended functionality.

 

Use the following syntax to include a file:

 

include FILE_NAME

 

where FILE_NAME is the name of the include file. (You do not need to provide the full pathname.)  For example:

 

include message.inc

 

The include file contains a declaration line for each function and subroutine that make up a specific library.