VMS Help DECnet-Plus, DCL Commands, APPEND, Qualifiers, /PARAMETER=CONCURRENCY_CONTROL  *Conan The Librarian (sorry for the slow response - running on an old VAX)

       /PARAMETER=CONCURRENCY_CONTROL=(parameter: value)

    Qualifier type:  Global qualifier

    Supported file   Remote files
    types:

    This qualifier gives users the ability to specify the file-locking
    parameters and values that are defined in ISO standard 8571. The
    possible file-locking parameters are:

    o  READ

    o  INSERT

    o  REPLACE

    o  EXTEND

    o  ERASE

    o  READ_ATTRIBUTE

    o  CHANGE_ATTRIBUTE

    o  DELETE_FILE

    The allowed values for these file-locking parameters are:

    o  not-required

    o  shared

    o  exclusive OR

    o  no-access

    Default action:  No concurrency_control is used