Custom backgrounds and banner messages on session logon screens
You can use the following commands to add a custom background or banner message to session logon screens. To add both a background and a banner message to session logon screens, you can embed the banner message into the background image.
create -k "HKLM\System\CurrentControlSet\Control\Citrix" -t "REG_SZ" -v "LogonDisplayString" -d "<text of custom logon banner message>" --force
create -k "HKLM\System\CurrentControlSet\Control\Citrix" -t "REG_SZ" -v "BackgroundImagePath" -d "<path to your custom logon screen background image>" --force
To use the feature on SUSE 15.3, install
imlib2 from <http://download.opensuse.org/distribution/leap/15.3/repo/oss/>.
Tip:
If you add a custom banner message using LogonDisplayString, the logon screen background is blue by default.