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

  Choose the Delete Library menu item from the File pull-down menu to
  delete an SCA library.  This command physically deletes a library
  from the disk.  SCA displays a warning dialog box asking you if you
  really want to continue this action.