VMS Help LICENSE, MODIFY, Qualifiers, /RESERVE  *Conan The Librarian (sorry for the slow response - running on an old VAX)

       /RESERVE=(user-name[,user-name,...])

    Specifies that the license or licenses are to be reserved for use
    by the users listed in the user-name parameter. Users not listed
    are denied access to the product. The value applied to user-
    name differs from product to product. See your Software Product
    Description (SPD) for details.

    Most products define user-name to be the user name OpenVMS
    maintains for each account. This is the name you type at the
    Username prompt during login.

    If your PAK specifies the RESERVE_UNITS option, you must assign
    one or more users to a reservation list. The number of user
    names allowed per list depends on the number of activity units
    available and a constant value or the License Unit Requirement
    Tables (LURTs). Calculate this number as you would for any
    Activity License. For example, a 200-unit license with a constant
    value of 100 is a two-user license.

    You can also create and modify a reservation list for
    Availability and regular Activity Licenses that do not specify
    the RESERVE_UNITS option. Because these licenses do not limit
    the number of names on the list, you can assign as many names as
    you like to the reservation list. All users not on the list are
    denied access.

    Although you can control license access to nodes with /INCLUDE
    and /EXCLUDE qualifiers and control user access with the /RESERVE
    qualifier, you cannot use these qualifiers on the same command
    line. If you want to use both types of control with the same
    license, you must enter separate LICENSE MODIFY commands.

    Use the /ADD and /REMOVE qualifiers for further control in
    modifying previously established reservation lists.