Some years ago I had to redesign old HMI interface. During this process I have created new HMI with also logging of all actions executed by engine.vi (core of application for executing test sequence), debugging step by step, looping of selected test and also most important it was able to replace engine.vi during runtime so if we wanted to add some steps in sequence we only need to replace one file without recompiling of whole project. Below you can see demonstration.