equired Reading, <a href="../req/das.html">das.req</a>, for a complete description of
   this format. Within the file record, the ID word has the format
<P>
 
<PRE>
   DAS/xxxx
</PRE>
   where the pattern
<P>
 
<PRE>
   xxxx
</PRE>
   represents up to four printing characters identifying the file type. For
   example, in DSK files, the ID word is
<P>
 
<PRE>
   DAS/DSK
</PRE>
   In general the portion of the ID word indicating file type need not
   indicate explicitly that the file is a DLA file. That fact 