In order to use the Essbase API functions in your program, you must include the file that contains Essbase API definitions.
To use the Grid API functions in your C program, you must include the Grid API header definitions file (ESSGAPI.H) in the appropriate source modules. If, in addition to Grid API functions, you are using regular API functions, you must also include the Main API definitions file (ESSAPI.H) in the appropriate source modules.
Always include these definition files after any C run-time library header files. If you are programming in the Windows environment, place ESSGAPI.H, and optionally ESSAPI.H, after the Windows include file WINDOWS.H.