changing locked station desktop screen

[wojtekf]

hi guys,

I have found how to change Logon Screen
it's binded to the registry entry:
HKEY_USERS on Local Machine\.DEFAULT\Control Panel\Desktop
wallpaper key .

Question : Do you know how to chagne the desktop wallpaper
when the station is locked? On my machine appears the same
wallpaper like when I am logged on (of course with no icons on , and with
lock information dialog , kind of a CAD prompt)

thanks
Wojtek