|Allows you to use HP-41 commands to create programs on a two dimensional grid, exploring new 2D concepts and extensions such as oriented labels and oriented begins. It is possible to change the direction of evaluation in a program using the special programming commands // and \. Also, down, up, left and right commands could be used to set a new direction. The special "reverse" instruction changes the direction of evaluation, in a program, to the opposite direction. There are buttons available to load, save and execute 2D programs.