title: What is the relationship between java:comp/env and java:global?
body: <p>What is the relationship between <code>java:comp/env</code> and <code>java:global</code> (regarding 3.1 spec)?<br>
  Seems like <code>java:comp/env</code> contains specific to EJB references. 
  What means "specific" in this case?</p>