How to work with "teye.exe": 1. Create a subdirectory of your choice 2. Copy the file "raytrace.zip" to that subdirectory 3. Extract the file "teye.exe" by unzipping the file "raytrace.zip" 4. Open a DOS-Shell and go to the subdirectory where "teye.exe" is 5. Start "teye.exe" Any comments are appreciated and should be sent via e-mail to wf@wfbabcom5.com