Odd behaviour with user accounts (accounts "hidden")

Hi all,

does anyone have an explanation for the following behaviour, which I
have observed on 2 different Windows XP (SP-2) machines, which are not
(and never have been) a member of a domain, and (as far as one can
tell) are mostly on their installation defaults:

I have 4 accounts: administrator and guest (created by the XP
installation), dad and kids. Like always guest is disabled,
administrator, dad and kids are members of the local "administrators"
group. To enhance security somewhat I want to remove the Kids from the
"Administrators" group.

* As soon as I remove "kids" from the administrators group the account
is not displayed any more on the login-screen, in other words my kids
need to use the alt-strg-del trick to access their account. As soon as
I put the kids account back into the administrators group it does
re-appear on the login-screenl. I also tried this with a different,
newly created account "test" as well: as long as I leave "Test" in the
administrators group I can select it for login, if I remove Test I
need Alt-Strg-Del to access it.

* Searched the documentations and the user management console up and
down, and found no option to make an account visible or invisible.

* I heard that Tweakui has the ability to control the visibility of
accounts, I downloaded that tool and tried it. It seems that I can
control the invisibility of accounts beeing a member of the
administrators group there, but I cannot control the visibility of the
"kids" account, as soon as I remove it from the amdinistrators group
it is no longer visible in Tweakui as well.

Who has an explanation for this behaviour, a link to the
documentation, or any other way how I can make the "Kids" account
visible when it is not a member of the "Administrators" group?

Thanks,

Armin
.

Relevant Pages

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    ... > account in power user group. ... > Power User account to Administrators group, ... You'd need to compare the NTFS permissions on the C: ...
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    ... Administrator account has its elevated privileges mostly due ... to its membership in the Administrators group. ...
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