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>How do I get the handle and window caption of each open window including minimized windows?

Re: How to have the list of programs on the taskbar ? Message #737104 should get you started. The following line filters out none taskbar windows

		* Check if window is visible and isn't WS_POPUP style
		IF  BITAND(m.Style, WS_VISIBLE) > 0 ;
				AND BITAND(m.Style, WS_POPUP) = 0

You can modify or remove it to suit your requirements.