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It is your password to let the server know that your browser is the one that
should be controlling the presentation.

If you don't initialize this, it defaults to a random value which will be
printed on STDOUT where (presumably) only you can see it.

=head2 viewers

A hashref of C<< ID => $context >> where C<$context> is the Mojo context
object for the client's websocket connection, and ID is the request ID for
that websocket.  This is updated as clients connect or disconnect.

=head2 published_state

A hashref of various data which has been broadcast to all viewers.
This keeps track of things like the current slide, but you can extend it
however you like if you want to add features to the client javascript.
Use L</update_published_state> to make changes to it.

=head2 page_dom