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From: Hans Bachner <hans@bachner.priv.at>
Newsgroups: comp.os.vms
Subject: Re: System UICs
Date: Fri, 7 Jun 2024 11:20:34 +0200
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Lawrence D'Oliveiro schrieb am 07.06.2024 um 04:32:
> As I recall, on VMS, SYSPRV privilege was effectively granted to any
> process whose UIC was in a “system” group. By default this was all UICs
> from [1,*] to [10,*] (octal), but I recall docs saying the upper limit was
> configurable.

SYSGEN> help sys_para maxsysgroup

Sys_Parameters

   MAXSYSGROUP

        MAXSYSGROUP sets the highest value that a group number can have
        and still be classified as a system UIC group number. Note that
        the specification is not in octal unless preceded by the %O radix
        indicator. This parameter is normally left at 8 (10 octal).

        MAXSYSGROUP is a DYNAMIC parameter.


> I also recall that, when you woke up the login prompt, the LOGINOUT
> process was created running under UIC [10,40]. I wonder if this was chosen
> to ensure that sysadmins would never lower the upper bound below 10 octal,
> they could only raise it? Did the UIC [10,40] have any other significance?
> Perhaps something from RSX-11 days?

Here, LOGINOUT is running under [1,4] (usually assigned to the SYSTEM 
account).

Hans.