The Information Center Facility is written in the TSO/E CLIST and REXX languages. You can use the trace commands provided with the Information Center Facility to diagnose problems in the facility's CLISTs and REXX execs. The commands provide three levels of tracing:

• Level 1 - activated by the TRACE1 command
• Level 2 - activated by the TRACE2 command
• Level 3 - activated by the TRACE3 command

When a CLIST is invoked for execution and Information Center Facilitytracing is active, the CLIST writes its name to the screen using a CLIST WRITE statement. The information appears as follows:

************************
**  CLIST=clistname  ***
************************

When a REXX exec is invoked for execution and Information Center Facility tracing is active, the exec writes its name to the screen using a REXX SAY instruction. The information appears as follows:

***************************
**  REXX exec=execname  ***
***************************

The ISPF dialog service LOG is issued at the beginning and termination of a CLIST/REXX exec. The following message is written to the ISPF log when a CLIST/REXX exec begins execution:

CLIST or REXX exec membername beginning execution.  ICQGA000

At the termination of a CLIST/REXX exec, the following message is written:

CLIST/REXX exec membername exiting; final condition code n.  ICQGA001

The executing CLIST/REXX exec determines the final condition code.