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

This documentation is contained in the Trident Panel download and after install it can be found in the folder :-
'Flight Simulator 9\Aircraft\DMFS Shared Files\HS121 Trident 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.