By changing your Xsession file you can start a kiosk-style machine that starts a single X11 application.
On Debian you would change the file /etc/X11/Xsession.d/99×11-common_start. In stock form there is a line that reads:
   exec $STARTUP
On Debian you would change the file /etc/X11/Xsession.d/99×11-common_start. In stock form there is a line that reads:
   exec $STARTUP