http://www.macnn.com/articles/02/03/21/zipcenter.adds/
ZipCenter adds ZIP code functionality to 4D
updated 11:35 pm EST, Thu March 21, 2002
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ZipCenter v1.6 is a plug-in that adds 5-digit ZIP code functionality to any 4D or 4D Server database. ZipCenter offers fast ZIP Code lookups, commands that perform area searches and files in both ZipCenter and ASCII formats. ZipCenter is available in both 'standard' and 'advanced' versions for $99 and $349.00, respectively; discounts are available for multiple-license purchasers.
