Requires the SECURITY privilege.

    Changes the system password rather than a user password.

    A system password can be from 0 to 32 alphanumeric characters.
    The dollar sign ($)  and underscore (_) are also permitted.
    Uppercase and lowercase characters are equivalent. All lowercase
    characters are converted to uppercase before the password is
    encrypted.

    A system password is valid only for the node it is set on. In an
    OpenVMS Cluster, each node can have a different system password.

    If a terminal line has the system password (SYSPWD)
    characteristic set, no terminal prompts are sent to that terminal
    until the system password is entered.

    The /SYSTEM and /SECONDARY qualifiers are incompatible. For more
    information about the use of system passwords, see the VSI OpenVMS
    Guide to System Security.