when visiting this URI:2. Will detection of the plugin be semi-automatic? I.e., if a user without the plugin tries to download a Squeak project, will he get an error, an ugly binary dump or something meaningful?>From what I remember, in the life without the plugin in all my browsers, if done "correctly" it will redirect user to the site where to find the plugin. If you use the simple version on top, it will do it right.