Ever have the need to insert a character which is not on your keyboard into a document? Common examples of this would be copyright or trademark symbol. You can insert these characters by using the Character Map program provided by Windows:

Start > Accessories > System Tools > Character Map

Simply select the characters you want, copy them to your clipboard, then paste them into your document. Character Map will even tell you Alt keyboard shortcut so you can insert them using the keyboard shortcuts in the future.