Morphic's stepping mechanism is used to make morphs lively. Simply implement a step method in your morph class, and that method will run once per second. If you implement stepTime, you can cause it to execute at a rate other than once per second. See class Morph for other stepping methods that are available.
If you want to enliven an application that is not using custom subclasses of Morph, you can also use the ability of SystemWindow's to step their model. Set your application as a model of some system window on the display, implement wantsStepsIn: to return true, and then implement a step method and possible a stepTimeIn: method.
