If the browser doesn't have the necessary software to run the plugin indicated in the
PLUGINSPAGE = "URL"
PLUGINSPAGE indicates the URL where the browser can get the software. It's a good idea to include this attribute for any plugin you use that isn't for the most common media types (MIDI, AVI, WAV).
For example, suppose we use a plugin which has the media type "whack/slack". (There isn't really any such type, this is just an example.) We could use the following
<EMBED ...> tag to indicate the
URL of where to get the plugin software.