Infinite Frame Traveling when Undoing?

Ex-Co-worker Morgan Loomis posted this mel before and I really enjoy using these days. So I would like to share. If I did 'alt + >' or 'alt + <' when working then tons of frame forwarding/backwarding happen when I undo it. This is a simple command that deletes forward /backward history so that allows to undo things what I really want to. I just switch commands from the original 'alt + >' and 'alt + <'.  Thanks to Morgan.

//forward
undoInfo -stateWithoutFlush off;
playButtonStepForward;
undoInfo -stateWithoutFlush on;

//backward
undoInfo -stateWithoutFlush off;
playButtonStepBackward;
undoInfo -stateWithoutFlush on;

If you want to see the original post Morgan did, visit here.

http://morganloomis.com/2009/animation-tech-tip-frame-step/