Here's a family file for the desktop's online help. Comments at the top of the file identify the family and release version.
!##############################################
!# #
!# Desktop Help Family #
!# #
!# Version 1.0 #
!# #
!##############################################
*.charSet: ISO-8859-1
*.title: Desktop Version 1.0
*.bitmap: /usr/dt/appconfig/help/C/cdelogo.pm
*.abstract: Overview and Basic Desktop Skills \
* File Manager and the Desktop \
* Front Panel \
* Application Manager \
* Style Manager \
* Text Editor \
* Mailer
*.volumes: Intromgr.sdl Filemgr.sdl FPanel.sdl
Appmanager.sdl Stylemgr.sdl
Textedit.sdl Mailer.sdl
The help family file actually included with the desktop software may not exactly match this example.