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Hartshorn conceded that police can use the database to search which political events an individual may have attended.
In most states, candidates who want to use the database have to be vetted first.
Athletes use the database to enter so-called "whereabouts" information which they are obliged to provide in order to make themselves available for drug testing outside competitions.
Officials at Elliman said they hoped potential buyers would use the database and portable computers to get access to listings as they walked through Manhattan neighborhoods.
A Meager Reward From Focused Ads Web sites and ad networks say advertisers have just been too harried to learn how to use the database tools.
Moreover, the Urban Justice Center will use the database as a model for building an internal database for its project to help the homeless.
Under the commission's proposal, the public could use the database to quickly report and find complaints about unsafe products.
He said that CardBrowser's 500 customers, including I.B.M., Apple Computer and Oracle, pay fees of $2,500 to $10,000 a year, depending on how they use the database.
"You can use the database qualities of the computer medium to drill down and get what you want -- for textbooks or the blueprints to a heating system or a physicians' reference book," he said.
It raised fears too about the decision by HMRC to use the database to build up the fullest possible list of all Scottish taxpayers to help trace everyone liable to pay a new Scottish rate of income tax.
