title: Close Window (Xcodes "Installation Alert") that has no kind of closing elements
body: <p>Is there a tool with which I can click on a window and the tool will tell me which process that window belongs to ?</p>
  
  <p><strong>Explanation:</strong></p>
  
  <p>I was working in Xcode 3.2.3 for iPhone OS 4.0beta3.
  Wanted to install old Xcode (all old SDKs got removed with beta3).</p>
  
  <p>Didn't want to waste time so I kept working in new Xcode for iPhone OS 4.0beta3 while downloading and then starting the installation of xcode 3.2.2 with iPhone SDK 3.2.</p>
  
  <p>After sometime there came this window:</p>
  
  <p>"Installation Alert"</p>
  
  <pre><code>In order to continue installation, please close the following application:
  Xcode
  </code></pre>
  
  <p>But by then I didn't want to interrupt my programming session as I was near a next milestone.
  Well, next day and after a Macbook standby I finally wanted to close the Xcode with SDK 4beta3 and finally install the old SDK.
  But the Installation Alert wouldn't disappear (even though Xcode was closed now). So I thought ok, then lets just stop and restart the Xcode Installation... So I went to the "Activity Monitor" and stopped the Xcode Installation. The Xcode Installation window got closed, but the "Installation Alert" is still there.</p>
  
  <p>So how do you get rid of such a window ?
  It has no buttons, no menu in which to select a "close window".</p>
  
  <p>Edit:
  Well a restart of course solves this problem. And I never faced this problem again.</p>