Console messages

z/OS® Explorer uses console message ID FEK910I to display data related to user exits.

Invocation of the exit routine is marked with the following console message:
FEK910I <EXIT_POINT> EXIT: invoking <exit_point> processing exit 
  in thread <thread_id>
All data written to stdout (echo command in a shell script, say command in a REXX exec) will be sent to the console:
FEK910I <EXIT_POINT> EXIT: <message>
Termination of the exit routine is marked with the following console message:
FEK910I <EXIT_POINT> EXIT: completed <exit_point> processing exit
 in thread <thread_id>