What do you use these tags for?
I think (can't remember for sure) object tags are for stuff like .swf files, or java applets, and so on.
i am only asking because Sr got a worm from an exe made by an HTML file, i am just wondering how the HTML file made and executed the file?
http://www.w3.org/TR/html401/struct/objects.html that site probably explains it in more detail than you want, but check it out