hey 'spdpro' . . . I very rarely use AH or PM Charts . . . all of my Trading Systems and Signals are TA based on 9:30 to 4 charts. I wouldn't know what the differences are and wouldn't have that interest since they work pretty well just using 9:30 to 4 charts. If you have an interest in researching that, I wouldn't mind you putting some charts up here and explaining the difference. Anything to help QQQ Traders out on this board. Thanks !!