title: How can I set environment variable WORKON_HOME for virtualenvwrapper-win
body: <p>I am trying to setup virtualenvwrapper-win on a usb drive as part of a python development environment. In <a href="https://github.com/davidmarble/virtualenvwrapper-win" rel="noreferrer">https://github.com/davidmarble/virtualenvwrapper-win</a> it states:</p>
  
  <pre><code>Optional: Add an environment variable WORKON_HOME to specify the path to store environments. By default, this is %USERPROFILE%\Envs.
  </code></pre>
  
  <p>but doesn't explain how to do this. Could someone help with this?</p>
  
  <p>My system python is at:</p>
  
  <pre><code>/f/python27/python
  </code></pre>