aightforward than writing a VILFile library.
</P>

<P>
To define a new type of Viewer-library compatible document, you will
need to do the following things:
</P>
<DL>
<DT><STRONG>Choose a four-character token.</STRONG></DT>
    <DD>When the Viewer library determines which VILFile library
        to use to view a document, it identifies the document's type by means
        of a four-character token.  In later examples we will use the 
        token 'TABV'.</DD>
<DT><STRONG>Create a document browser applicati