Library /sys$common/syshlp/sca$menu.hlb sca__open_lib  *Conan The Librarian (sorry for the slow response - running on an old VAX)

  The Open Library dialog box allows you to create a new library or
  activate an existing library.  If the new library you create has the
  same name as an existing library, SCA lets you replace the library
  with the new one.  When you subsequently invoke SCA, it uses a
  logical name to reestablish the active library list.