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  <title>Login functions</title>
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<p>
Depending on the configuration of <span
style="color:darkblue">SWI</span><span style="color:maroon">SH</span>,
the user may be able to login using either local login or federated
login from e.g., Google or Stackexchange (e.g., Stackoverflow).  Login
gives some additional features:
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  <li>
<p>
A <b>stable identifier</b> associated an <i>avatar</i> of choice and
email address flags documents and chat messages u