he ellipsis button to navigate to the $(WIN32API) directory
  and add it automatically. After pressing OK Delphi will be able to find the units
  for every new project without the need to specify the directory again.

  <p>
  If you performed the steps above you can start using the units in your application
  by including the appropriate ones in your uses clause. I personally prefer to
  use Project Options instead of Environment Options to avoid problems. One known
  problem is that when you use the Eniron