The two main groups of software program are application software program and system software. The most typical type of software application, application software application is a computer software package that carries out a particular function for a user, or in some instances, for another application. System software program rests in http://history.lib.ntnu.edu.tw/wiki/index.php/%E4%BD%BF%E7%94%A8%E8%80%85:Toolx9