title: User P_FSSUserffffffff and S_FSSUserffffffff on all Windows Service Fabric nodes
body: <p>In my computer management console I can see two users <code>P_FSSUserffffffff</code> and <code>S_FSSUserffffffff</code> and they are in group <code>FSSGroupffffffff</code>.
  There are also some more groups starting with WF-App following some random numbers. For example <code>WF-App-4294967295-c983f0a0ccb3235a199072e7538a3bb4</code>.</p>
  
  <p>Seriously. <strong>Any documentation on that?</strong>
  Does Service Fabric rely on these users?</p>