Adobe InDesign CS5 - Rounded Corners

Select a frame and click on the yellow square icon located on the frame edge to enter Live Corner Edit mode. (You can also press the number four key on your keyboard.) You'll now see four yellow diamonds in each corner. Click-and-drag one of the diamonds to adjust the corner radius of all four corners at the same time. To adjust only one corner, hold down the Shift key as you drag the diamond. To cycle through the six different corner styles, Option-click (PC: Alt-click) on one of the yellow diamonds. To exit Live Corner Edit mode, either press the four key again, or deselect the object.