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The last set of interface elements that you will encounter in Mac OS X Leopard are the various data views and there are three that you may encounter that are built into the operating system that applications can use. One if a simple table which has rows and columns. Another is an outline view and inside the code that's available to developers is all the code that let's you expand and contract each line of an outline view. And the third data view is a browser in which you have two separately scrolling sets of data. Now that doesn't mean that an application cannot come up with other controls, other data views and many, many of them do. But these are the basic tools that are available to anyone and to you if you want to build your own applications. Whether their built in the COCO environment, Apple script or any of the others that we'll talk about towards the end of this tutorial. But these are standard things and developers like to use them because as soon as people encounter them, they can see what it is that they have in of them and know what they should be able to do. On the Mac as opposed to on other operating systems frequently you see people spending less time poking around, clicking on things, trying to figure out what they do because in this environment we often know what they do because people are using the standard user interface. So these are the controls that you're going to find available to you to control application. They all live inside windows, let's take a look at windows now.