</blockquote>

<p>
<b><tt>hwnd</tt></b> is used as the parent window handle for any windows
created by Ghostscript.  <b><tt>hwnd</tt></b> may be <b><tt>NULL</tt></b>
if the caller has no windows, but if it is <b><tt>NULL</tt></b>, you should
avoid using devices which may open windows.

<p>
A return code of 0 (zero) indicates no errors, and the code may now call
<b><tt>gsdll_execute_begin()</tt></b> or <b><tt>gsdll_exit()</tt></b>.  If
the return value is non-zero then <b><tt>gsdll_exit()</tt></b> must not b