Pass control

This presents different options for passing control to a procedure.

• Use the CALL command
  The Call Program (CALL) command calls a program named on the command, and passes control to it.
• Use the CALLPRC command
  The Call Bound Procedure (CALLPRC) command calls a procedure named on the command, and passes control to it.
• Use the RETURN command
  The Return (RETURN) command in a CL procedure or OPM program removes that procedure or OPM program from the call stack.