After battling with transcendental functions, the next step was to create a small demo. It's a console application that provides an interactive RPL calculator. Simplistic by design, this demo is not intended to show how the final user interface will look or feel. It's a barebones application that displays a minimal stack and a prompt. Depending on how successful this demo is among users, perhaps a GUI version will be developed later. A pre-compiled version of this demo will be made available for the most popular operating systems, to encourage testing. This means the first alpha release is getting closer and closer.