title: Does Windows Installer provide a method to update applications?
body: <p>Does Windows installer provide a built-in method for updating applications, or do I have to write this myself in my application code?</p>
  
  <p>For example, ClickOnce can automatically update my application for me; I do not have to write code specifically for this in my application. Is similar functionality available in Windows Installer or is it purely for installation purposes only?</p>