InDesign 1.9 Changing the magnification of a document

If you close the Application bar, the zoom controls appear in the lower-left corner of the document window.  How to close it?
What's the difference between Fit Page In Window and Fit Spread In Window?

Using the Zoom tool
1. Scroll to page 1. Choose View > Fit Page In Window to position the page in the center of the window.
2. Select the Zoom tool in the Tools panel and position it over the yellow car.
3. Click once. The view changes to the next preset magnification, centered on the point where you clicked.
4. Alt + Zoom tool(-)
5. Click once and the view is reduced.
6. With the Zoom tool still selected, drag a marquee around the car. The smaller the marquee, the larger the degree of magnification.
7. In the Tools panel, double-click the Zoom tool to switch to a 100% view.
8. Click the Selection tool in the Tools panel and position it in the document window.
9. Ctrl + spacebar can turn the Selection tool icon to the Zoom tool icon (+).
10. Ctrl + Alt + spacebar can turn the Selection tool icon to the Zoom tool icon (-).
11. Choose View > Fit Page In Window to center the page.