The F11 is at the top of the keyboard along with the other F keys, F1-F12. They have many uses. The F11 key though is great for seeing the whole picture or at least a lot more of it. The F11 key is quick and easy to use. Basically F11 is a quick way to get to the full screen option. Depending on the size of your screen along with using the Ctrl Scroll trick(the previous post to this one) you should be somewhat happy with the results.
To get rid of the full screen simply hit the F11 key again and there ya go.