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Yes, this is also possible
The ID and Password can be found on the "Menu" page on the Calendar Clock application. It is possible that this page has been disabled by one of the Administrator applications. In that case it is not possible to see the ID and Password anymore. In this case the ID and Password can be found in the application of the Administrator application. You can generate a new ID and Password by re-installing the application.
The appearance of the Calendar Clock application can only be changed from the Administrator application. The person with this app can connect to the Calendar Clock and then go to the "Preferences" page to change the appearance.