All system commands related to process monitoring and control can be entered through MARC, except for the primitive commands (commands preceded by two question marks). You can use these commands to monitor or control processes initiated from the current MARC session or processes initiated from other sources, such as CANDE or an ODT.

You can enter system commands on the COMND screen or in the Action field of any screen that displays “COmnd” as a prompt. However, system commands that you enter through MARC are screened for security. Many system commands are available only if the usercode of the session has privileged, SYSTEMUSER, or security administrator status. For details, refer to Tasking Command Equivalents in this section.

Each MARC session receives a unique number, also called the session number, which appears in the output from some system commands, including mix display commands. The session number is assigned from a range of numbers defined by the MAX (Maximums) system command. Depending on the range defined, the session number can be as low as 100 or as high as 65535.

The MARC session number does not appear as a process in mix display commands. However, the session number does appear in the output from two system commands: Y (Status Interrogate) and C (Completed Mix Entries). The output from these commands shows both the job number and the mix number of a process. If the process is a task, and it was initiated from a MARC session, then the job number shown is the MARC session number.