Unexpected but nice feature in Windows. You can grab and start dragging an object with your pointer, then use Alt-Tab to bring the required application window to the foreground where you can drop the object. Previously, I thought both the originating and destination windows had to be visible at the same time on the desktop for a drag-and-drop action. Useful if you usually maximize your work windows on your desktop. For example, if you have your Excel window maximized, then realise you have to insert a TXT data file, you can either locate the file using the file browser dialog or drag-and-drop from Explorer into Excel.