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==== Flightgear Subsystems ====
The Flightgear and Simgear codebase can be broken down into subsystems. Some of these are Managed and accessed through simgear's SGSubsystemMgr. Others have their own componentManager independent of SGSubsystemMgr. Still others have no Manager function per se.
* How Sub-Systems are managed
* How the main event loop works
* How properties are set and how their values are accessed. This includes understanding the concept of "tied" properties.