VMS Help SET, SECURITY, Qualifiers, /EDIT  *Conan The Librarian (sorry for the slow response - running on an old VAX)

    Invokes the access control list editor (ACL editor) and allows
    you to modify an ACL interactively. The ACL editor does not allow
    the asterisk (*)  and the percent sign (%) wildcard characters
    in an object name. You must specify the object whose ACL you are
    editing.

    The /EDIT qualifier must be the first qualifier on the command
    line; other qualifiers can include /CLASS and, if the class is
    SECURITY_CLASS, you can include the /PROFILE qualifier. Whenever
    an object does not belong to the FILE class, you also need to
    specify /CLASS.

    Refer to the ACL editor in the OpenVMS System Management
    Utilities Reference Manual for more information.