# Native callback setup [Back to External process languages](https://rustic-game-engine.pages.dev/markdown/guides/gameplay-programming/external-process-languages.md). | Language | Setup | | --- | --- | | Python | `from rustic import rustic, instance, Game, run`; define callback functions; `run(globals())` | | C# | `using static Rustic;`; `Run((callback, dt) => { ... });` | | C | `#include "rustic.h"`; `rustic_run((RusticBehavior){.on_start=start})` | | C++ | `#include "rustic.hpp"`; `rustic_run(RusticBehavior{.on_start=start})` | | Java | `class RusticBehavior extends Rustic`; call `run((callback, dt) -> { ... })` in main | | PHP | `require __DIR__."/rustic.php"`; `rustic_run(["on_start"=>"on_start"])` | | Luau | `return {on_start=function() ... end, fixed_update=function(dt) ... end}` | Each SDK handles omitted callbacks automatically. Supported names are `on_create`, `on_start`, `on_enable`, `fixed_update`, `update`, `on_disable`, `on_destroy`, and `on_stop`. Only frame callbacks take dt. Luau also accepts the capitalized Lua aliases. External collision callbacks remain unavailable. API 1.1 adds shared `Events` to every supported script type, backed by the same scene services. See [Shared gameplay actions](https://rustic-game-engine.pages.dev/markdown/guides/gameplay-actions.md) for coverage and setup. Use `rustic.log` for game diagnostics and run scripts through Play. See the [language guides](https://rustic-game-engine.pages.dev/markdown/engine.md) for complete copyable examples, attachment steps, native return types, current limits, and troubleshooting.