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.