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Your code yields control until the timer ticks and can then start (or resume) what it really wants to do. For example, if you wanted a 'visual progress indicator' to update, you might fire a timer to start things rolling, do 100 things, fire the timer again and stop, do 100 more, fire the timer again and stop, etc. until you are 100% complete. Every time you fire the timer and stop your code you allow the Visual LANSA Web engine to change how the progress indicator looks.