Potential users include postal workers and those in the military and the health-care industry.

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Strict security measures at the Postal Service required regular password changes and forced users to select nonobvious passwords, which are harder to remember.

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That's handy for the train-schedule app, since Mr. Strange recently added a feature that lets users search for the nearest station to a postal code but he's not sure anybody needs or uses it.

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Fans may also have been turned off by the band's requirement that users register by providing their name and e-mail and postal addresses.

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