Windows Vista contains an enhancement to the system clock that permits you to display two additional hours when you drift the mouse over the system clock.

Here is an example of the London clock:

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Adding these extra clocks is very simple. First, right-click the clock in the system tray and choose Adjust Date / Time:

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Click the Additional Clocks tab, and choose the options and time zone as shown:

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You can enter a friendly name display. We entered the "London", but you can put something relevant to you, as the name of a family member living in another place.