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[zorphnog]

I understand what you're saying, but given my testing and the fact that it doesn't seem to make a difference, do I really need the BitAND/BitSHIFT?

No, you don't have to have it. What I posted was only an example. You are, of course, free to use whatever works best for you. I only included the bit shifting because I usually want to do specific actions for different controls. The $iIDFrom variable will contain the ctrl handle (without having to call GUICtrlGetHandle i.e. you could do If $iIDFrom = $inTest instead of If $hWnd = GUICtrlGetHandle($inTest)). The $iCode variable will contain the actual notification code. For an edit control it can be: EN_ALIGN_LTR_EC, EN_ALIGN_RTL_EC, EN_CHANGE, EN_ERRSPACE, EN_HSCROLL, EN_KILLFOCUS, EN_MAXTEXT, EN_SETFOCUS, EN_UPDATE, EN_VSCROLL, or WM_CTLCOLOREDIT. From everything you posted so far, you don't really need to go that in depth. I just like to post the proper way to do message processing when I make examples.