Once you've created a graphics layer (as described in How to add a graphics layer), you need to add graphics to it to display data. In most cases, you'll create graphics using geometries that have been created by actions such as executing a query or drawing a shape on the map.
/ Classtalk : A classroom communication system for active learning. In: Journal of Computing in Higher Education. 1996 ; Vol. 7, No. 2. pp. 3-47 @article{cc819104b3034becb09019ef6c28d94c,
When you start Classtalk up you must choose a Classfile and when you do Classtalk checks to see if there is a folder in your Classtalk folder with the name SF for X where X is the name of the Classfile. If Classtalk does not find such a folder it creates one. So try this: 1) Quit Classtalk if it is running. 2) Look in your Classtalk folder and find the Classfile that contains the registration data for your Class. Change its name; ie From Chemistry 1000, To Chemistry 2000.