If the manual has not appeared in a separate browser window, use this link to view it... Comet Manual

This documentation is contained in the Comet Panel download and after install it can be found in the folder :-
'Flight Simulator 9\Aircraft\DMFS Shared Files\DH106 Comet 4 Documentation'
The FS2004 models are set up to use the documentation through the FS2004 kneeboard.  This allows you to view the contents from within the cockpit in FS.