It is in Group Policies. Computer Configuration, Windows Settings, Security Settings, Local Policies, Security Options.

Interactive Logon: Message text for users attempting to log on.
Interactive Logon: Message title for users attempting to log on.

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Doug Knox, MS-MVP Windows Media Center\Windows Powered Smart Display\Security
Win 95/98/Me/XP Tweaks and Fixes
http://www.dougknox.com
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Per user Group Policy Restrictions for XP Home and XP Pro
http://www.dougknox.com/xp/utils/xp_securityconsole.htm
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"Alan T" <AlanT@discussions.microsoft.com> wrote in message news:07CC024E-A31A-44F5-8E8A-DF5FE72CC610@microsoft.com...
> Dear all,
>
> In XP, how can I enable popup windows (with my customized message) after
> user logon?
>
> My situation is that:
> I would like to pass some information to users when they login our windows
> XP client machines. As I would like this message only popup when user login,
> "net send" command seems cannot help my case. Furthermore, I cannot find any
> policy rule in AD about that.;-(
>
> Thanks in advance.
> Alan