Guest accounts are fully functional RPTU accounts. That means, all services of the RPTU can be used.
If only a WiFi guest account is needed, you can find more information here: https://hotline.rhrk.uni-kl.de/help/de-de/33-wlan/641-ich-bin-gast-an-der-rptu-und-mochte-das-w-lan-nutzen-z-b-fur-eine-tagung.
The application for a fully functional guest account is done via the same web form as for new RPTU employee accounts. You can find more information about this here: https://hotline.rhrk.uni-kl.de/help/de-de/1-rptu-account/584-ich-mochte-fur-meine-mitarbeiter-innen-rptu-accounts-beantragen
Tips: When requesting approval, please enter an appropriate status (external partner or similar) and time limit. You will also need the birthday and location of the guests.