A joint NYPD-Microsoft Corp. crime-fighting system is expected to bring in about $100 million to New York City coffers after it is licensed to two major cities, police Commissioner Ray Kelly said Friday.

Kelly wouldn't disclose the names of the two cities in licensing discussions for the "domain awareness" program, a system that ties together anti-terrorism surveillance and crime-fighting technologies to a variety of databases. But he said one was in the United States and the other was a major international city. Kelly said a more formal announcement would be made soon about the deal.

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The system links license-plate readers, thousands of security cameras and other sensors being used in zones such as the lower Manhattan security area and midtown with law enforcement databases. Kelly unveiled the system at a security forum last summer in Aspen, Colo.

City officials and Kelly later said they expected the city to reap millions of dollars in revenue from licensing the technology, a figure which he put Friday as potentially $300 million.

The money pulled in by the city would go straight to the general fund and would not be earmarked for the NYPD, Kelly said.

The system allows surveillance cameras to track a vehicle around the city and, by linking to databases, find out details about its ownership and where it had traveled recently, officials said.