I didn't know which thread would be appropriate for this subject so I picked this one.
2D GUI applications running on Windows and Linux (or on the Gnome desktop, at least) can be made accessible to blind users via an underlying mechanism that allows developers to embed special attributes into their widgets. Things like a name and a description of a text field, for example, can be made available to a screen reader. The state of a pushbutton (is it depressed?), and the "labeled by" relationship of a group of radio buttons to a nearby text string in the GUI are examples of accessibility attributes. We need to be sure VW architectures make it possible to embed similarly useful information into 3D internet apps. I'm attaching an image below to give an example of the kind of metadata you might want to have available.