[NTG-context] Stand alone Context editing environment

All, At: http://www.pragma-ade.com/download-1.htm There is: http://www.pragma-ade.com/context/install/mswincontext.zip Can someone explain to me what this is? If it is downloaded and unzipped, is it ready to go? Is there documentation of this particular zip? Is there an editor in this zip configured and ready to go? Very curious.