1). “:123U” means UDP port 123, which is the port used by NTP.
2). The router allows you to create multiple calendars, each covering different domains. When you create a calendar with no domains listed, the calendar covers all web sites. When you create a calendar with google.com listed in the “Sites” field, then that calendar only covers the Google sites, such as www.google.com, docs.google.com etc. When there are multiple calendars on a profile, the calendar that most closely matches the site being visited wins. However, if you have two calendars both listing the same domain but with different time ranges, then the behavior is not defined.