sentences:  For example, a word processing document would hold page objects, paragraph objects, sentence objects, word objects, and character objects.The user could select objects by clicking on them with the mouse, and press dedicated special keys on the keyboard to invoke standard object functions (open, delete, copy, move) in a uniform way.There was also a "Show Properties" key used to display settings, called property sheets, for the particular object (e.g., font size for a character object).