You can only enable it, not enforce it.
And I wouldn't do it, it will most likely slow things down
considerably.

Here are the details:

How can I configure a default wallpaper for my remote users?
http://ts.veranoest.net/ts_faq_configuration.htm#wallpaper

_________________________________________________________
Vera Noest
MCSE, CCEA, Microsoft MVP - Terminal Server
TS troubleshooting: http://ts.veranoest.net
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MarineGeek <slrobb.TakeThisOut@gmail.com> wrote on 23 jul 2008 in
alt.os.citrix:

> Our Marketing department just created an image that needs to be
> set as the default background for all Citrix users. What is the
> easiest way to accomplish this? Is there a way to set this
> within Citrix, or do I have to configure it via Group Policy?
> Any information would be greatly appreciated.
>
> Thank you in advance