title: What does "Merging down" and "Copying up" mean in perforce streams?
body: <p>I'm currently working with the perforce API for .net. I'm trying to understand the concept of streams and graphical view of the streams. </p>
  
  <p>"Merging down" changes from a source stream and "Copying up" changes to a stream are the two terms I came across. I'm not really clear about the difference, because based on this only, the stream graph is getting generated. </p>
  
  <p>This is the URL, which I'm looking into now. <a href="https://www.perforce.com/perforce/r12.3/manuals/p4sandbox/04_usegui.html" rel="nofollow noreferrer">P4V streams</a>.</p>
  
  <p>Can someone please tell me what it means?</p>