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.
Definition of nature for English Language Learners. : the physical world and everything in it (such as plants, animals, mountains, oceans, stars, etc.) that is not made by people. : the natural forces that control what happens in the world.