Format
      RUN SYS$SYSTEM: XGCP
    To invoke XGCP, enter the following command at the DCL prompt:
    $ RUN SYS$SYSTEM:XGCP
    XGCP displays the following prompt, at which you can enter any
    XGCP command:
    XGCP>
    To exit from XGCP, enter the EXIT command at the XGCP> prompt, or
    press Ctrl/Z.