VMS Help V73 Features, System Management Features, New System Parameters, WBM_OPCOM_LVL  *Conan The Librarian (sorry for the slow response - running on an old VAX)

    WBM_OPCOM_LVL controls whether write bitmap system messages are
    sent to the operator console. (Write bitmaps are used by the
    volume shadowing software for minicopy operations.) Possible
    values are shown in the following table:

    Value Description

    0     Messages are turned off.
    1     The default; messages are provided when write bitmaps are
          started, deleted, and renamed, and when the SCS message
          mode (buffered or single) changes.
    2     All messages for a setting of 1 are provided plus many
          more.

    WBM_OPCOM_LVL is a DYNAMIC parameter.