I've just done a google search and it found about 8 links on EGPWS. One of these was a link to a video YouTube, which answers your questions.
www.youtube.com/watch?v=TUZbOoQrlXQ
The pprune system is preventing the link from working directly, but if you do the google search you can open it from there.
Last edited by keith williams; 11th Feb 2013 at 09:37.