Howto:Writing backward compatible code in Nasal
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Objective: Write backward compatible Nasal code by determining dynamically what features are available, i.e. to see if new Nasal extension functions or new fgcommands are supported by a FlightGear binary or not. This is important when developing Nasal code that needs to run with old versions of FlightGear, while still supporting the latest features available in FlightGear Git/HEAD.