An alert is a kind of pre-defined form, which has a caption and a message. It is intended for displaying error or warning messages during an application. You can put up an alert by creating an instance of the Alert class and passing it to Display.setCurrent(), just as you would to display a canvas or form. Despite the similarity between an Alert and a form, Alert is not a subclass of Form (sigh). An Alert can be self-lowering, that is, it can take itself off the display after a certain time elapses.