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# 0: General Information
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- **Programming Language**: C / C++
- **Build System**: Make / BTB (Build the Build)
- **Purpose**: System Call Interface (SCI) for NeKernel
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# 1: How It Works
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- This header provides the raw API surface for accessing NeKernel's system calls.
- It is **not** directly used by applications.
- Instead, it is abstracted by the **SystemSDK**, which presents a stable, high-level interface.
- At runtime:
- System calls are routed from user-space code to the **kernel syscall manager**.
- The syscall manager executes the requested operation and returns control to `libSystem`.
- Finally, the result is delivered back to the originating process.
- This separation ensures that:
- The SCI remains low-level and close to the ABI.
- `SystemSDK` provides portability and shielding from changes in syscall internals.
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