Hi Wisman
Download this library:
http://sine.ni.com/apps/we/niepd_web_display.DISPLAY_EPD4?p_guid=B45EACE3EF4556A4E034080020E74861&p_node=DZ53008&p_submitted=N&p_rank=&p_answer=&p_source=External
Here you'll find a VI which is called "Screen saver control.vi". This VI provides the user with the ability to get or set the timeout of the screensaver, as well as determine whether the screen saver is active.
Hope this helps
Luca
Regards,
Luca