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lock
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lock [ password "<password_string"> ]
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Lock the keyboard or define a password string.

If 'password' is given then <password_string> is saved as the
unlock string.

If no parameters are supplied, the keyboard becomes locked when a
password was specified earlier.

If the keyboard is locked, the password is requested.  If a
correct password is supplied, the keyboard becomes unlocked.

The setting of the password and locking of the keyboard can only
been done at the system console keyboard or in the /autoexec.nos
startup file.  The password can not been displayed.
