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 | A radio button is used where it is necessary to choose only a single option out of a number of given options. After clicking on the desired button it remains highlighted unless you change it. | 
| Checkbox | A Checkbox is used when it is necessary to use an  | 
| Dialog Box | A dialog box is used when it is necessary to choose certain options to perform a function. In the simple example shown on the left, there is a choice of only two options offered via a radio button: Screen or Printer. However a dialog box may contain a large number of  options including radio buttons, checkboxes and data entry fields. A dialog box always contains either an OK, Print or Save and a Cancel button and one of these buttons must be chosen to continue.  | 
| Drop Down List | A Drop Down List is displayed in a window, as a box with a down arrow and 'drops down' when clicked on. Once it has been displayed in full, a selection can be made in the same manner as a normal menu. | 
Command Terminology
| Pop-Up Menu  | A Pop-Up menu pops-up when you click on a cell in either the:  | 
| Hypertext Links  |   |