An interactive-pane is an editor with a process reading and processing input, and that collects any output into itself. The class listener-pane is built upon this, and adds functionality for handling Lisp forms.
The top-level-function is called to process any input that comes into the stream. The first argument is the interface containing the interactive pane. The second argument is the interactive pane itself. The third argument is the Common Lisp I/O stream. The function should read from the stream to activate the interactive-pane. The default runs a Lisp listener top-loop.
This class was named interactive-stream in LispWorks 3.2 but has been renamed to avoid confusion (this class is not a stream but a pane that contains a stream). The class interactive-stream and its accessors have been kept for compatibility but may be dropped in future versions of LispWorks.