Any reader wanting to create their own application for the ElektorBus has so far had to be content either with making small modifications to the demonstration software we have given, or has had to start from scratch, guided by our examples. Here we change all that: we show how you can rapidly develop an application with a custom user interface, and modify it instantly as needed. The concept is based on HTML and Javascript, and so the central control station can run on a wide range of platforms, including PCs and smartphones.