How do I get a result? What is .exr file exactly?

[cloo]

Answer:

The result is on your computer, its exact path is displayed on naclys web based interface , http://locahost:20348

[william]

Exr is an advanced file format, often used when you want to post process your render because it handles much more details than an png file. For more details, have a look at the wikipedia page : http://en.wikipedia.org/wiki/OpenEXR