IBM H Series Installation And Service Manual page 216

The System Management Services screen contains the following choices.
Config: Enables you to view your system configuration.
MultiBoot: Invokes the Mulitboot menu which provides several
functions:
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RS/6000 Enterprise Server Model H Series Installation and Service Guide
To Select a Common Hardware Reference Platform
(CHRP) compliant operating system to boot
In the case of AIX this is a supported option, if you receive
an informational icon after making this selection this would
mean that information in non-volatile storage could have
been lost, as would happen if the battery had been
removed. In order to recreate this value, issue the bootlist
command under AIX with the appropriate parameters as to
the location of the operating system in a particular hard
disk. Please see the explanation of the bootlist command
in your AIX documentation.
To select a CHRP compliant operating system as the
default operating system
To install from the list of possible devices
To set the sequence in which devices are searched for
operating system startup code
To go to the Open Firmware command prompt
To set the Multiboot menu so that it comes up immediately
as the system powers up