If the volume.sdl file for the volume you want to display is either in the current directory or has been registered, execute this command:
dthelpview -helpVolume volume.sdl
Or, if the volume.sdl is in another directory (and hasn't been registered), execute this command:
dthelpview -helpVolume /full-path/volume.sdl
The -helpVolume parameter can be shortened to -h in any of these commands.