title: MVID module version id
body: <p>I Have few questions regarding MVID that i hope you can help me,</p>
  <p>Based to my understanding the MVID is automatically generated by the compile.</p>
  <ol>
  <li><p>Can you please help me to understand in which situations the compiler will not generate a new MVID during the compiling process?</p>
  </li>
  <li><p>Can you please help me to understand the meaning each group in the MVID line,</p>
  <p>For example:  // MVID: 913D3D64-AD35-4A08-A426-62217E68CEB4</p>
  </li>
  </ol>
  <p>Prompt answer will be appreciated.</p>
  <p>Sincerely
  Chen</p>