Compaq AlphaServer DS20E Reference Manual page 160

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halt
The halt command halts the managed system. The RMC firmware exits
command mode and reconnects the user's terminal to the system COM1 serial
port.
RCM>halt
Focus returned to COM port
haltin
The haltin command halts a managed system and causes the halt to remain
asserted. This command can be used at any time.
haltout
The haltout command releases a halt that was done with the haltin command.
help
The help or ? command displays the RMC firmware commands.
poweroff
The poweroff command requests the RMC to power off the system. The
poweroff command is equivalent to pressing the Power button on the control
panel to the Off position. If the system is already powered off, this command
has no immediate effect.
To power the system on again after using the poweroff command, you must
issue the poweron command.
6-10 DS20E Reference Guide