NotesThe Shelf is an interface feature in NeXTSTEP and OPENSTEP, and is used as a repository to store links to commonly used files, directories and programs, and as a temporary "holding" place to move/copy files and directories around in the file system hierarchy. In Mac OS X, items may be dragged onto the sidebar area of the Finder while holding the Apple key, but these do not behave as placeholders and cannot be manipulated in the below manner.FeedUnfurl
NotesDragging and dropping is a great way to get stuff done on your Mac, but DragonDrop makes it even better. DragonDrop lets you set down what you're dragging, leaving you free to find your destination without worrying about keeping the mouse button held down.Unfurl
Shelf (computing) - Wikipedia, the free encyclopedia