CleverKeys is used as a spell checker and for looking up synonyms.
It can be used with most applications, including Microsoft Word, Outlook Express and your favorite browser. Just highlight a word and either press the control button and click or hold down the mouse button. You can then choose "Lookup at Dictionary.com" or look for synonyms at Thesaurus.com. In addition, you can search the Web and shop at Amazon.com from the same menu.