• I can't access the Thermostat Admin interface
• I get '404: File not found' when I click on 'Change admin password'
• What should be the duration of the thermostat calendar entries?
• What happens if I have conflicting calendar entries?
• Can other applications interact with the Thermostat?

The Admin interface is available at http://thermostat:7878/admin/. If you cannot access it at this address you can alternatively use http://smartappl.appspot.com/locate/serial_number from your LAN. Replace serial_number with the serial number of your thermostat.

This happens when you access the Admin interface at http://thermostat:7878/admin instead of http://thermostat:7878/admin/. This issues was fixed in newer models.

Calendar entries should have a 5 minutes duration. For example, if you want to send a cool75 command to the thermostat at 6 PM create a calendar entry between 6:00 - 6:05 PM with the subject cool75.

One of them (arbitrary chosen) is applied. Conflicting entries are not recommended. It is also not recommended to use the calendar assigned to a thermostat for other purposes. It makes sense though for a calendar to be shared by multiple thermostats and, thus, to be kept in sync.

Yes, see the API used by the iGoogle Gadget or the direct API.