Getting a COBOL routine traceback

Often when you get close to a programming error, you want to know how you got into that situation, and especially what the traceback of calling routines is. To get this information, issue the command:

LIST CALLS ;

For example, if you run the COBCALC example with the commands:

AT APPEARANCE COBVALU AT ENTRY COBVALU;
GO;
GO;
LIST CALLS;

the Log window contains something like:

 AT APPEARANCE COBVALU
   AT ENTRY COBVALU ;
 GO ;
 GO ;
 LIST CALLS ;
At ENTRY in COBOL program COBVALU.
From LINE 67.1 in COBOL program COBCALC.

which shows the traceback of callers.