Terasology/subsystems/README.MD

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# Subsystems
Subsystems provide and extend engine functionality that might not be needed all the time.
A subsystem can provide an API to be implemented by other subsystems (API subsystem). Such an API subsystem does not provide any functionality on its own.
Typical examples for subsystems are:
* platform integration (e.g., Discord)
* native libraries usage
* network activity
> :warning: **Subsystems should not extend or provide gameplay features!** Use Modules instead.
>
> It is planned to allow combinations of modules with subsystems for new functionality in the future.
### Comparation between Module and Subsystem functionality:
| | Module | Subsystem
--------------|---------------------------------------------------|----------
Boot | at game start | at game launch
Sandbox | Yes | No
Installing | Yes, in-game download from server or repository | No, with facade or engine only
Dependencies | only another Modules | any, except Modules
Build Script | engine-driven | free-style