I want to set up my background slide show to display certain backgrounds at certain times of the day. However, I can't quite seem to find documentation anywhere that says exactly how the picture change timer works. So, say I set it to change once a day. Does that mean it changes at midnight, or does it start timing the 24 hours right when I set it? What about if I set it to once every 6 hours? Also, if the computer shuts down or goes to sleep, does that affect the timer at all? Or does it still keep track of what background it should be displaying?