[x0054]

Why on earth would you need more than a simple one way API between the FMS and IFE to be able to show inflight progress. For that matter, why would it be more complicated than a simple serial cable with just the O pin on the FMS side, and just the I pin on the IFE side to feed information at regular intervals to the IFE. I have no idea how exactly the systems are setup, but off the top of my head I can come up with several VERY simple methods of insuring that the communication between the FMS and IFE is in deed unidirectional. If this story is true, I would be highly disappointed in Boeing!

[neurotech1]

Its unidirectional in hardware. The exact details are more complicated, but there is only physical wires for a one-way link from the FMS side.

[verystealthy]

Don't you have to call an API?

[x0054]

neurotech1 above says that it's unidirectional in hardware, so it's a moot point. But you could also do a simple relay server with API. FMS pushes the info to a "server" through a one way link. IFE would request the info from the server and displays it as necessary.