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.
Independent business. An independent business is a business that is free from outside control. It usually means a privately owned establishment, as opposed to a public limited company, the latter of which is owned by investment shares traded in the stock market. In many cases, independent businesses are sole proprietorship companies.