This applet demonstrates:1、receiving multiple files from a drag-drop operation 2、being a drag-drop source 3、optimizing the viewer for performance--creating thumbnails on the fly and owner draw issues 4、usability issues--changing image and form sizes and utilizing a non-paging scrollbar -This applet demonstrates : 1. receiving multiple files from a drag-drop oper.html ation 2, being a drag-drop source 3, optimizing performance for the viewer -- creat ing thumbnails on the fly and owner draw four issues , usability issues -- changing image and form sizes and utilizing a non-paging 9x15