The Get Systemwide Information routine provides a simplified
    interface to the $GETSYI system service. The $GETSYI system
    service obtains status and identification information about the
    system. LIB$GETSYI returns only one item of information in a
    single call.

    Format

      LIB$GETSYI  item-code [,resultant-value] [,resultant-string]

                  [,resultant-length] [,cluster-system-id]

                  [,node-name]