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 BUSINESS PRACTICE: Essential features of processes needed to effect standard operating procedures in a consistent manner. The Law Dictionary Featuring Black's Law Dictionary Free Online Legal Dictionary 2nd Ed.