/sys$common/syshlp/helplib.hlb CMS, SHOW, RESERVATIONS, Command Parameters  *Conan The Librarian (sorry for the slow response - running on an old VAX)

 element-expression

    Specifies one or more elements for which CMS displays current
    reservation and concurrent replacement information. If you do
    not specify an element expression, information is displayed for
    all elements. An element expression can be an element name, a
    group name, a wildcard expression, or a list of these separated by
    commas.