objects are already in 3D by default so normally a web page will have what is called 3D animation where the model[s] run around on a timed loop to show how they move... example of this kind of site is mixamo.com where the animations allow you to see how your human model would look jumping or swinging a sword
the advanage of this system is its easy to code and backwards compatable with people still using Windows 7 or on limited download like a phone
4D is what Adobe shows in their online demo... all be it a very limited version of it. in this senario a user normally clicks on the screen with their mouse to spin the object or pan their camera around it
object that can be made to be 'interactive' becomes 4D or to do it another way, if you can somehow change your view point then you are looking in 4D
the advanage is it looks cool for about 2 minites while the client plays with it but the codes are not backwards compatable with most Linux, old Windows, Mac or Phone users so it value is mostly as a sales prop
I recommend you goto the Dreamweaver forum and ask the nice people to take pity