Such sources can then be built into an array, each element of which is programmed to fire whenever required.

ECONOMIST: Modern X-ray technology

For the rest of the day, whenever required, he played.

ECONOMIST: Bill Millin

Couriers are barred by law from using their computers while driving, and FedEx is required to blank the screen whenever a delivery van is in motion.

FORBES: FedEx Bites Into Bluetooth

Whenever fiduciaries fail to meet the standard of care required of them, theoretically they face the risk of litigation.

FORBES: The Art of Theft: How Corporate Fiduciaries Steal From American��s Pensions (February 2, 2005 )

The TSA is required to insert a Notice of Inspection card whenever your luggage is hand searched, but writing personal notes, while not unprecedented, is probably frowned upon by supervisors.

FORBES: TSA Agent Gropes Most Intimate Parts of Woman's Luggage

He urged those in the audience to use fresh ingredients whenever possible and for many of the drinks, such as the Bajan Sorrel, resting is required in order for the flavors of the herbs and spices to blend.

FORBES: Barbados, The Rum Island

Secondly, sex offenders will have to notify the authorities whenever they are living in a household with a child under the age of 18 and they will be required to notify the authorities weekly as to where they can be found when they have no fixed abode.

BBC: Q&A: Sex offenders register