FSUIPC

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People familiar with Microsoft-based flight simulators, and addons, will typically expect a middleware like FSUIPC to be also required for working with FlightGear (FSUIPC is a mechanism to access simulator internals in FSX/MS FS).

However, FlightGear is open source and does not need such a middleware. In fact, most of FlightGear's internals are made accessible in the form of the so called Property tree. Furthermore, the Property Tree can be exposed/accessed via various interfacing mechanisms, such as for example:

• a built-in web-server
• a built-in telnet (props) server
• an XML configurable generic protocol
• custom binary protocols

(to name just a few).