The D5200 is also compatible with a new wireless radio frequency remote accessory, the WR-R10 and WR-T10 Wireless Remote Controllers.

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Another goal: to make Songdo the largest so-called ubiquitous city, where wireless networks and radio-frequency identification will link all information systems--every laptop, stoplight, cell phone, TV and toaster.

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This development is made possible by a new wave of technology: radio-frequency ID chips the size of pepper grains, broadband wireless and Web-based "dashboards" enabling monitoring and management.

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They emitted so much radio-frequency interference that Mr. Clark struggled to get a clear signal for the band's wireless instruments and in-ear monitors.

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