title: Change SystemParameters
body: <p>Just a quick question: What exactly is the SystemParameters class? Is it just a collection of "default values" or is it actually kind of hooked into windows? </p>
  
  <p>Background: For Drag&amp;Drop operations we are using the SystemParameters.MinimumHorizontalDragDistance and SystemParameters.MinimumVerticalDragDistance properties to detect D&amp;D. For Touch screens the default values are to small and I'm wondering if I have to implement some configuration mechanism to change this values or if I can change some system settings somewhere (lets say registry or control panel or whatever).</p>
  
  <p>Thanks!</p>
  
  <p>Update: With the detailed answer below I finally did find what I ws looking for. Just for reference if anybody else is looking for it in the future: The Minimum Drag Distance can be changed in the registry</p>
  
  <pre><code>HKEY_CURRENT_USER\Control Panel\Desktop\DragHeight
  HKEY_CURRENT_USER\Control Panel\Desktop\DragWidth
  </code></pre>
  
  <p>By default both values are set to 4 (px). Be aware that the changes only take effect after reboot.</p>