Hi! To compile this demo, first compile the definition modules. After they are done, compile all the implementation modules. Then just link the whole thing together. By the way ARC truncates file names to eight characters (the dreaded MS-DOS strikes again). You'll have to rename each file to be the same as the module name. When the program runs, to see the trails press the selection button down while moveing the mouse. Enjoy, Richie (CIS 75716,352)