docs: def doIt(rh):
      """
      Perform the requested function by invoking the subfunction handler.
  
      Input:
         Request Handle
  
      Output:
         Request Handle updated with parsed input.
         Return code - 0: ok, non-zero: error
      """
  
      rh.printSysLog("Enter cmdVM.doIt")
  
      # Show the invocation parameters, if requested.
      if 'showParms' in rh.parms and rh.parms['showParms'] is True:
          rh.printLn("N", "Invocation parameters: ")
          rh.printLn("N", "  Routine: cmdVM." +
              str(subfuncHandler[rh.subfunction][0]) + "(reqHandle)")
          rh.printLn("N", "  function: " + rh.function)
          rh.printLn("N", "  userid: " + rh.userid)
          rh.printLn("N", "  subfunction: " + rh.subfunction)
          rh.printLn("N", "  parms{}: ")
          for key in rh.parms:
              if key != 'showParms':
                  rh.printLn("N", "    " + key + ": " + str(rh.parms[key]))
          rh.printLn("N", " ")
  
      # Call the subfunction handler
      subfuncHandler[rh.subfunction][1](rh)
  
      rh.printSysLog("Exit cmdVM.doIt, rc: " + str(rh.results['overallRC']))
      return rh.results['overallRC']