Windows Service applications run in a different window station than the interactive station of the logged-on user. A window station is a secure object that contains a Clipboard, a set of global atoms, and a group of desktop objects.
That is the nature of the business is a term that means that  something happens because it is common experience for the event you  are performing or doing.
Nature, in the broadest sense, is the natural, physical, or material world or universe. Nature can refer to the phenomena of the physical world, and also to life in general. The study of nature is a large part of science.