Parameter in IEASYSxx (or supplied by the operator)

   CLOCK= {aa          }
          {(aa,bb,...L)}

The two character identifier (aa, bb, and so forth) is appended to CLOCK to identify the CLOCKxx member of SYS1.PARMLIB. If you specify the L option in the syntax of the CLOCKxx member, or in reply to the ‘SPECIFY SYSTEM PARAMETERS’ message, the system writes all statements read from the CLOCKxx member to the operator's console.