This is a 2.44 minute video comprising several short cilps of proto 4,
ROCAT-proto4-2lo.wmv is 320x240 6.8MB
ROCAT-proto4-2hi.wmv is 640x480 15MB
The bigger version is better if you have a fast connection. To download, click on the appropriate file above and 'save to disk' then, if you double-click on the file, it should start in Windows Media Player.
If you haven't got Windows Media Player on your machine, you can get it from: