ILBOBEG
ILBOBEG is a COBOL routine that:
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Initializes COBOL library subroutines if the NORES option is in effect. (When RES is in effect, INIT2 and ILBONTR0 perform this function.)
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Issues messages.
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Performs termination functions.
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Determines which program exit to take.
If the Subroutine Communications Area (SUBCOM) has not been link-edited, ILBOBEG loads the area and checks whether its calling program is the main program or a subprogram.
Reference Sources
IBM OS/VS COBOL Subroutine Library Program Logic, LY28-6425.
IBM OS/VS COBOL Compiler Program Logic, LY28-6486.