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

  Click on this button or the Name Entry box to activate this
  selection.  Enter the name of the class from which you want SCA to
  begin the class browser query.  If you do not specify a class name
  for the Using attribute, SCA displays all classes used by this class.