VMS Help CMS, SHOW, ELEMENT, Command Parameters  *Conan The Librarian (sorry for the slow response - running on an old VAX)

 element-expression

    Specifies one or more elements to be listed. If you do not supply
    an element expression, CMS lists all the elements in the library.
    An element expression can be an element name, a group name, a
    wildcard expression, or a list of these separated by commas.