screen savers


I would like to use my own screen saver, ( which access some device to cut
off backlight ) on QNX6 / Photon 2

In QNX 4 / Photon 1 , it’s quite easy,:
you need just to write a program, wich is called by photon desktop, this
program does your specific job (i.e disable the screen ) and handles signal
SIGTERM, and when photon decides to wake up it sends the signal and you
make the job in your signal handler (i.e enable the screen ) and exit.

Anyone have experienced this on QNX6/Photon 2 ?
it seems slightly different, I didn’t found anything about that on the