If you press on the F8 key, you enable what Word refers to as extend mode.
This is the keyboard method of anchoring the cursor in preparation for making
a selection. When you move the cursor using the cursor control keys, the size
of the text selection changes and the letters EXT appear on the status bar.
You turn off the extend mode by pressing the Esc key.
One of the handy things to do in extend mode is to search for other text.
For instance, let's say you wanted to select everything between the current
cursor position and the next occurrence of the word "echo." All you need to
do is turn on extend mode (press F8) and then search for "echo." Word selects
everything between the two points.
When you press the F8 key multiple times, you can select different parts of
your text. For instance, when you press F8 once, you simply turn on extend
mode. Press it a second time, and the current word is selected. A third time
results in the current sentence being selected. A fourth time selects the
current paragraph, and a fifth time selects the whole document.
