title: SAML Redirect to specific IDP (Salesforce vs Arcot + PING + Siteminder)
body: <p>We need to support the following Authentication flows</p>
  
  <ul>
  <li><p>User 1 logs into Salesforce using Salesforce Credentials</p></li>
  <li><p>User 2 logs into Salesforce using Arcot +Ping + Siteminder credentials</p></li>
  <li><p>User 2 logs into Custom App using Arcot + Ping + Siteminder credentials</p></li>
  </ul>
  
  <p>Since all the authentication methods above are SAML, I need to find a way to address home realm discovery that is a unusual "mesh" of authentication flows.</p>
  
  <p><strong>Question</strong></p>
  
  <p>How should I set up the IDP and RPs to handle this scenario? </p>
  
  <p>How would home realm discovery work?</p>