Includes 3D (Original) and Virtual 3D; the premier drill design products on the market. 3D is the most widely used drill design software on the market. Used by high school, college, university and corps around the world. 3D and Virtual 3D editions are identical with one exception: Virtual 3D includes a utility program called the Virtual Clinic. This program is capable of analyzing a drill for stride, collision, and music balancing problems. It also includes a critique editor used by college and university instructors to critique a students drill. See http://www.pyware.com for more informationa and system requirements.Includes 3D (Original) and Virtual 3D; the premier drill design products on the market. 3D is the most widely used drill design software on the market. Used by high school, college, university and corps around the world. 3D and Virtual 3D editions are identical with one exception: Virtual 3D includes a utility program called the Virtual Clinic. This program is capable of analyzing a drill for stride, collision, and music balancing problems. It also includes a critique editor used by college and university instructors to critique a students drill. See http://www.pyware.com for more informationa and system requirements.