IBM H SERIES RS/6000 - Manual (Page 80)

MultiBoot
This selection invokes the Mulitboot menu which provides several functions:
To Select a CHRP compliant operating system to boot
In the case of AIX this is a supported option, if you receive a an informational
icon after making this selection this means 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. See the explanation of the bootlist command in your AIX documenta-
tion.
To select a particular 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
4-6 RS/6000 Enterprise Server Model H Series User's Guide