Hi, I'm researching for weeks to understand FlightGear system.

First, I tried to examine the source code of FlightGear project, it was hard
though. Although I understood some basic things, such as which source file
is needed for what, I couldn't go into details.

Then, I researched the wiki page and saw that there is an API system called
property tree, it can be accessed by C++, XML or Nasal scripting language. I
studied Nasal a bit and learned how to use it.

Actually what i want to do is that I want to print some logging properties
directly on the FlightGear screen. I couldn't see any information how to
print something directly on the FlightGear screen. I can handle properties
with Nasal and show them on terminal but as i said i want them to show up on
gamescreen.

If anyone knows, can you just explain how I can do it, at least which source
file? Or is there a declared API function to do that?
Any help would be appreciated, thanks!!!
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