This question is so basic that I am embarrassed to even ask; but here goes anyway . . . . With Windows I could click on the equivalent of the green+ icon in the upper left corner of the screen and cause that window to enlarge to completely fill the screen. With OSX, this green+ icon in the upper left corner does not seem to perform any useful function. It does toggle between a larger and smaller window, but there does not seem to be a way to do the Windows equivalent with this function so that one click fills the screen. Am I missing something? Sorry this is so lame, but I have been using a Mac for a year, and I just don't use the green button.