Video that starts by showing an Emacs editor with a Lisp REPL running. The McCLIM demo app is started. It shows a new window with many standard, gray UI buttons with labels of the various demos they could launch. The pointer is moved rapidly across the buttons to trigger the "on hover" highlighting effect. There is a noticable lag between when the mouse is over the button and the button highlighting. Next, the "Stream Test" demo is started. It shows yet another new window with a large white area. When the mouse hovers or moves within this area text is rapidly displayed with information about the CLIM event e.g. CLIM:POINTER-MOTION-EVENT x:... y:.... and CLIM:POINTER-ENTER-EVENT, etc., one per line.