EF="string.html">string match</A></B>.  If the
specified <I>keyName</I> does not exist, then an error is generated.
<P><DT><A NAME="M9"><B>registry set </B><I>keyName</I> ?<I>valueName data </I>?<I>type</I>??</A><DD>
If <I>valueName</I> is not specified, creates the key <I>keyName</I> if
it does not already exist.  If <I>valueName</I> is specified, creates
the key <I>keyName</I> and value <I>valueName</I> if necessary.  The
contents of <I>valueName</I> are set to <I>data</I> with the type
indicated by <I>ty