Library /sys$common/syshlp/sca$menu.hlb sca__ps_class_using  *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.  SCA will find uses of the class name that you specify.
  If you do not specify a class name for the Used by attribute, SCA
  displays all uses of this class.