When you want to set off a paragraph with a horizontal line, you can switch from the keyboard to the mouse and click the appropriate border tool — or you can simply type it in. For example, suppose you would like to separate the following sentence from the rest of Section One:

After you type the sentence, press Enter, type three hyphens, and then press Enter again, as shown below. (I’ve turned on the Show/Hide button to reveal the keystrokes.)

Word draws a single line above the second paragraph mark and positions the insertion point marker to begin  the next paragraph:

If you prefer a thicker line, substitute the underscore (_) character for the hyphen. Using an equal sign (=) will produce a double line. The tilde character (~) will produce a wavy line, while an asterisk (*) will produce a dotted line. Finally, typing the number sign (#) three times produces this border:

Note that Word’s AutoCorrect border option must be set for these keys to work. Go to Tools | AutoCorrect. (In Word 2007, click the Office button, click the Word Options button, point to Proofing in the left column, and then click the AutoCorrect Options button.)

In the AutoCorrect Dialog box, under the Apply As You Type section, select the Border Lines check box:

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