title: How/Where are the environment variables in a Visual Studio C++ project set?
body: <p>There a lots of environment variables in my project properties that I do not understand. Clicking on macros (<a href="https://stackoverflow.com/questions/1460798/is-there-a-list-of-visual-studio-environment-variables">Is there a list of Visual Studio environment variables?</a>) gives me a list of their values, but I am unable to figure out where some of these are set.
  For example, I am trying to figure out where the variable <code>$(IntDir)</code> is being set.</p>
  
  <p>What file is responsible for setting these variables? How can I modify them?</p>