Compaq AlphaServer ES45 1B Owner's Manual page 90

OpenVMS Systems
OpenVMS systems require an ordered pair as the flags_value argument:
root_number and boot_flags.
root_number Directory number of the system disk on which OpenVMS files
are located. For example:
root_number
0 (default)
1
2
3
boot_flags The hexadecimal value of the bit number or numbers set. To
specify multiple boot flags, add the flag values (logical OR).
For example, the flag value 10080 executes both the 80 and
10000 flag settings. See Table 3–1.
3-8 ES45 Owner's Guide
Root Directory
[SYS0.SYSEXE]
[SYS1.SYSEXE]
[SYS2.SYSEXE]
[SYS3.SYSEXE]