IBM F50 RS/6000 7025 - Manual (Page 75)

MultiBoot:
This selection invokes the Mulitboot menu which provides several functions:
To Select a particular 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 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 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
The Select Software option, if supported by the operating system, shows the names
of the operating system installed. This option may not be supported by all operating
systems.
In the case of AIX this is a supported option, if you receive a message saying that:
No Operating System Installed
Chapter 3. System Management Services 3-7