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Features of the original document layout such as columns, tables, line and letter spacing, pagination, and margins will not be preserved in the text version. If you need the complete document, download the WordPerfect version or Adobe Acrobat version, if available. SDR is a new generation of technology that would allow communications equipment to adapt to multiple standards and add service features without changes to the equipment's hardware. SDR holds the potential to enhance our participation in the global economy, to access new services, and to use the spectrum more efficiently. For example, SDR could facilitate the development of secondary markets for spectrum, because equipment could more easily operate under different parameters in different places.