iFly produced a Software Development Kit (SDK) for these two aircraft that allows 3rd party developers access to numerous Events and Variables specific to their iFly 737/747 products.
The Virtual Flight Sim Hardware suite of software has been linked to these SDK's so that all the iFly 737/747 Events and Variables are available.
iFly 737/747 Events
When assigning iFly Events to Components you will normally use the Event Action of NOTHING.
All iFly Event names begin with "KEY"
Note that EVT_CLUSTER_<SYSTEM>_<NAME> allows the assignment of a group of aircraft controls to a Component, i.e. a group of controls have been clustered together to respond as one.
iFly 737/747 Variables
All iFly Variable names are non capitalised (e.g. FD_left_Switches_Status), unlike SimConnect Variables which are capitalised e.g. GENERAL_ENG_MASTER_ALTERNATOR4.