A useful demonstration for a computer-use model records the task, the screen state, and the actions that connect one state to the next. Cua'shuman-trajectory tutorial describes recording those interactions, adding explanatory messages, reviewing the result, and tagging the task. It recommends retaining recoveries from mistakes, so a demonstration can show how a person handles an unexpected interface state. The resulting records are material for training and analysis; the tutorial teaches their collection without reporting a measured improvement in a trained model.