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.
While there is no single standardized definition, there are many opinions and beliefs as to what it means for a business to be sustainable. While the study of sustainability evolves, The Evergreen Group has decided to use the following definition: A sustainable business is one that operates in an environmentally responsible way. Its products and business processes are such that no negative environmental impact is felt as a result of their existence. The details of sustainable business lie in chemistry and material science, ecology and environmental science.