3.13.3 Completion dialog

When the Use in-place completion option (see Selecting the completed input) is off, all keyboard completion gestures raise a modal dialog presenting a choice of completion options.

Also, clicking the button to the right of a text input pane raises a modal completion dialog.

You can navigate the choice with Up and Down and you can select the desired completion at any time with Return , double-click, or press the OK button. To cancel the attempt to complete, press Escape . Filtering modal dialog completion

Common LispWorks User Guide (Unix version) - 21 Feb 2008