dstring' class='copiable-anchor'> &para;</a></span></dt>
<dd><p>This is a convenience procedure which will start a write watch on
&rsquo;port&rsquo; for writing a string to the port.  It calls &rsquo;await&rsquo; if it has
to wait for output to become available.  The event loop will not be
blocked by this procedure even if only individual characters or part
characters can be written at any one time (although if &rsquo;port&rsquo;
references a socket, it should be non-blocking for this to be
guaranteed).  It