When another application quits, The Tilery will often come to the front because it窶冱 the next application in line. This isn窶冲 always what you want. The Deference feature lets you choose a different behavior:
窶「 Don窶冲 Defer If The Tilery comes to the front, it simply stays there. (This is the standard behavior.)
窶「 Defer to Next App The next application behind The Tilery will come forward, as if The Tilery were not there.
窶「 Defer to Finder The Finder is always brought forward.