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Downloadable computer application software for mobile phones, namely, software for allowing users to perform electronic business transactions, for use in database management, for use as a spreadsheet, for use in word processing, for use in inputting and accessing data and viewing images, for use in viewing comparable properties, for use in receiving a valuation, for use in making and receiving offers, for use in scheduling an inspection, for use in accessing an on-line marketplace for sellers and buyers in the field of residential real estate, all in the field of residential real estate; downloadable database software for managing information in the field of real estate