ICA Override Registry Values

Citrix Allows for User overrides of ICA settings like Wallpaper and other desktop settings.

These registry setting override the ones from within MFCFG.EXE or Terminal server admin.
Administrators can use a Terminal Server registry hive to override user settings, such as wallpaper, animation effects, and screen savers.

Create a key named UserOverride in the following location. Some recommended entries follow:[HKLM\SYSTEM\CurrentControlSet\ Control\Terminal Server\WinStations\ICA-tcp\UserOverride

Some recommended entries for under \control Panel\Desktop
"AutoEndTasks"="1"
"CursorBlinkRate"="-1"
"DragFullWindows"="0"
"MenuShowDelay"="10"
"WaitToKillAppTimeout"="20000"
"SmoothScroll"=dword:00000000
"Wallpaper"="(none)"