This section demonstrates some advanced features of AsTeR that are
useful when rendering complex documents. AsTeR recognizes
cross-references and allows the listener to traverse these as
hypertext links. Cross-referenceable objects can be labeled
interactively, and these labels can be used when referring to such
objects within renderings. The ability to switch among rendering rules
enables multiple views and allows the listener to quickly locate
portions of interest in a document. By activating rendering rules, all
instances of a particular object can be floated to the end of the
containing hierarchical unit, e.g., all footnotes can be floated to
the end of a paragraph. This is convenient when getting a quick
overview of a document. AsTeR also provides a simple bookmark
facility for marking positions of interest to be returned to later.
Finally, AsTeR can be interfaced with sources of structured
information other than electronic documents. Later, we demonstrate
this by interfacing AsTeR to the Emacs calculator.