xyzzy &#60;shfit&#62;+&#60;return&#62; doesn't work in minesweeper, which was the first thing I 'tested'. I also tried xyzzy &#60;return&#62;  &#60;shift&#62;+&#60;return&#62; because that's how I remembered it.  (<a href="http://en.wikipedia.org/wiki/Xyzzy" rel="nofollow">http://en.wikipedia.org/wiki/Xyzzy</a>)