Explain the systems startup process and include the files used by systems for configuration. Describe the order these files are checked.
Please clarify which system's startup process you want me to explain.
Below is an instruction that describes a task. Write a response that appropriately completes the request.

### Instruction:

Explain the systems startup process and include the files used by systems for configuration. Describe the order these files are checked.

### Response:

Please clarify which system's startup process you want me to explain.
