title: How do I collect key input in a video-game style Cocoa app?
body: <p>I'm hacking on a simple Cocoa app to make blocks move around the screen like a video game.  I need to detect key presses, but I'm not going to have text entry fields like a dialog box would have.</p>
  
  <p>How do I get key presses without text controls?  In particular, I need to get arrow keys.</p>