In Lisp mode, both parentheses delimiting a form are highlighted when the cursor is at one of them. The new behavior is particularly useful in Microsoft Windows emulation and Macintosh editor emulation, because the cursor can be outside the visible region. In LispWorks 5.0 and previous versions only the parenthesis opposite the cursor position is highlighted.
The highlight uses a light green background by default. Its appearance is controlled by the Editor Style preference named "Show Point".