VMS Help DCE_SECURITY, Admin Intro, DCE$EXPORT, EXPORT, Data Qualifiers, /MEMBER_UIC=member_uic  *Conan The Librarian (sorry for the slow response - running on an old VAX)

       /MEMBER_UIC=member_uic

    Specifies the member part of the UIC for the OpenVMS
    account. MEMBER_UIC should be specified as an octal
    number within the range 0 to 177776 (octal).

    The default is to use the first available member UIC
    within the group UIC (as specified by /GROUP_UIC). For example,
    if the selected group is 150 and that group has members 1,
    2, 5 and 6 already defined, then the new uic would be
    [150,3].