Copy the executable file for the display to the /usr/lib/xscreensaver/hacks/ directory.
Add the command for the screensaver display to the XScreenSaver file or the $HOME/.xscreensaver file.
To run the screensaver display on the whole screen rather
than in a window, include appropriate arguments. For example, you
might want to include the –root option to display
the screensaver display on the whole screen.