Exit Program EACSCALL will be called, if it exists in the client job library list, each time an external program or procedure is called by the client application, using Easycom API.
This exit program can refuse the program or procedure call by the client application.
It can also change the program name, library name or procedure name on return, so that the client application will call another program.
See source example in EACSYSSRC file, Easycom library.