Feel free to contact me if you have any questions or great ideas concerning expanding the current product. The meaning of keys can be found by simply placing the mouse on top of that key. If a key has multiple meanings, two labels will be displayed on it, one on the top and the other on the bottom. White colored label is the current key's name, whereas blue colored label is disabled.
Current mode is display in title bar at the top of the calculator.
Re-enter your input if a mistype might have occured. Otherwise a new round of calculation is started. You can either use key pad to enter your expression, or just type in your expression using keyboard. The first three keys are used to specify x range or the expression you want to plot. If you have anything else in mind, or would like to work on any of these enhancement with me, let me know.