Sometimes you're working with two applications and don't want to swap between them to much. You can arrange them side by side to maximize your available desktop space.
Sometimes you have so many windows open, you don't know where to look first. Here is a simple way to clear the clutter so you can concentrate on the job at hand.
In timesheets and project plans it is often needed to calculate the number of days from hours planned. You can't just divide the sum of hours by 8 or 7.5.