 in the application's main program;  it must be passed
<I>argv[0]</I> as its argument.  It is important not to change the
working directory before the invocation.
<B>Tcl_FindExecutable</B> uses <I>argv0</I>
along with the <B>PATH</B> environment variable to find the
application's executable, if possible.  If it fails to find
the binary, then future calls to <B><A HREF="../TclCmd/info.html">info nameofexecutable</A></B>
will return an empty string.
<P>
On Windows platforms this procedure is typically invoked