>I want to reposition forms from top/left to center based on whether _screen is normal or maximized. Is there a (hopefully easy) way to do this?

There is no natural way because _SCREEN doesn't have events. One more solution is timer to check _SCREEN.Left,Width and so on. Another way is to disable(remove) real _SCREEN buttons (e.g. _SCREEN.Maxbutton=.f.) and provide toolbar or even separate buttons imitating regular ones. Now you have Button.Click events.