What could prevent Deep Sleep?

FROM : Jesus De Meyer
DATE : Sun Oct 31 23:06:57 2004

Hi again,

I received an email from one user of my application telling me that my
app is preventing his computer from going into deep sleep. Now I
seriously doubt that since all I do is check every 5 seconds to see I
need to update some parts of my app.

My computer doesn't seem to have any trouble at all to go into deep
sleep mode, with my app running.

So I wonder, when developing an app, could you write code that would
prevent the system from going into deep sleep? And if so, what kind of
code would that be?

Thanks,

Jesus