Component Programming example

[Jonathan A Dunlap]

The example:
http://www.drdobbs.com/architecture-and-design/component-programming-in-d/240008321?pgno=4

import std.stdio;
import std.array;
import std.algorithm;

     void main() {
         stdin.byLine(KeepTerminator.yes)    // 1
         map!(a => a.idup).                  // 2
         array.                              // 3
         sort.                               // 4
         copy(                               // 5
             stdout.lockingTextWriter());    // 6
     }

I don't understand what happens to the output. On windows, I can 
keep entering lines but no output gets displayed. Also, can 
someone explain a bit more about lockingTextWriter?

Thanks!