Compaq AlphaServer DS20E Reference Manual page 217

When you enter the login command, you are prompted for the current system
password. If a password has not been set, a message is displayed indicating that
there is no password in NVRAM. If a password has been set, this prompt is
displayed:
Please enter the password:
If the password entered matches the password in NVRAM, when the prompt is
redisplayed the console is no longer in secure mode and all console commands
can be performed during the current console session.
NOTE: If you enter the login command when a halt assertion exists, the
command fails, even if you enter the correct password.
If You Forget the Password
You can clear the password from the local console terminal or from the RMC.
From the Local Console Terminal
If you forget the current password, use the login command in conjunction with
the control panel Halt button to clear the password, as follows:
1. Enter the login command:
P00>>> login
2. When prompted for the password, press the Halt button to the latched
position and then press the Return (or Enter) key.
The password is now cleared and the console cannot be put into secure mode
unless you set a new password.
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Using the SRM Console 7-49