This is for one page apps without using CGI. If you choose to use CGI then you have more options. Currently it doesn't very well on node.js so we're targetting the browser JS engine first.
sorry, you can not write to local files
So, basically you are writing normal rebol/renc code but your GUI is JS, and I/O has all JS limitations
If we could run on node.js then those latter issues are addressed since it's no longer blocked by browser security considerations
Note that this stuff runs on your phone so you can start to write phone apps