# Security

D3 provides several levels of security, including:

- File retrieval and update lock codes.

- Separation of user and account, each with their own unique passwords.

- Privilege levels.

- Port logon control. After three unsuccessful log on attempts, the port is disabled to prevent further attempts. To re-enable the port, press any key, other than ENTER, followed by pressing ENTER twice. This is primarily in cases where someone is using a dial-up line and gets line noise, which could be interpreted as an invalid an log on.

## See also

- [File lock codes](https://d3codex.com/definitions/file-lock-codes/)
- [mds file](https://d3codex.com/systemfiles/mds-file/)
- [Passwords](https://d3codex.com/definitions/passwords/)
- [Restricted system access](https://d3codex.com/definitions/restricted-system-access/)
- [System privileges](https://d3codex.com/definitions/system-privileges/)
- [users file](https://d3codex.com/systemfiles/users-file/)

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Source: https://d3codex.com/definitions/security/ - part of the D3Codex reference.