Vax 613 0S Manuel d'instructions Page 255

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16.4.14 ! (COMMENT)
Precedes a comment on a command line.
>>> !
comment
>>>
command
!
comment
The system does not execute input following a comment character on the current
line.
16.4.15 Console Security
The console features a password mechanism that restricts the use of console
commands that might compromise system security. Unsecured workstation
consoles might allow unidentified users to boot and halt a system or to modify
memory and continue privileged operation. Commands that can compromise
system security are known as privileged commands.
When the password feature is enabled (see the description of the SET
PASSWORD command), the console operator must enter the LOGIN command
to enter a privileged state before executing privileged commands. The LOGIN
command requires a previously set and encrypted password. In addition, secure
mode must have been previously set by means of the SET SECURE command
and a jumper on the I/O module must be present to enable the security mode.
16.4.16 Console Password Register
An encrypted password is stored with three other fields in four consecutive NVR
entries. The first three longwords contain the encrypted password and the second
longword contains the security flags. Figure 38 and Figure 39 describe these
registers.
16.4.17 Privileged Console Commands
Privileged console commands are commands that perform one of these:
Examine or modify memory and registers, such as SET, EXAMINE, DEPOSIT,
FIND, and SHOW.
Transfer control of the CPU from the console monitor to another program
such as BOOT and START.
Privileged commands may be executed only when the console is in a privileged
state. The console is in a privileged state whenever the PRV bit in the Security
Flags is 1 or the password system is not enabled. Attempting to execute a
privileged command when not in the privileged state results in the following error
message:
?23 ILL CMD
Several commands are non-privileged, because their use does not compromise
security. They may be executed by the console at anytime, regardless of the state
of the console. They are:
The LOGIN command to enter the privileged state.
BOOT command with no parameters.
The CONTINUE command, which returns the processor to its context before
the CPU halt. Users who accidentally pressed the Halt button can execute a
CONTINUE command.
Console 16–31
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