Dell Command | Configure Version 4.1.0 Command Line Interface Reference Guide

Valid Argument	Enabled, Disabled
Description	Controls the ability to set the system password. If the password is locked, it cannot be changed. The lock argument locks the current state of the system password. If a system password has been set, it cannot be removed. If a system password has not been set, it cannot be set. On specific BIOS settings, this feature does not work. For more information, see the BIOS documentation.

--PasswordLock