{auth} renders its content once when a user is logged in to this application -
by padLogin ( $row ) or padAttempt ( ... ) - with the user's row as its
data: every field of it is a {$field} inside, {$name},
{$email}. The password and token fields were never kept, so they are not there.
For a guest the part after its own {else} renders, or the @else@
half. The tag owns that {else}: an {if} around it keeps its
own. {guest} is the reverse and hands over no data.
Reading the user never starts a session the visitor did not bring - a guest's page makes no
session - but a request that brings the remember-me cookie is logged in here, the first time
anything asks. padUser ( 'name' ), padUserId () and
padAuthCheck () ask the same from PHP.
The examples run without a login, so the runnable one shows the guest's half; the other is shown, not run.