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When delegates to the Republican National Convention assembled in New York in August 2004, the streets and sidewalks near Union Square and Madison Square Garden filled with demonstrators. Police officers in helmets formed barriers by stretching orange netting across intersections. Hordes of bicyclists participated in rolling protests through nighttime streets, and helicopters hovered overhead.

These tableaus and others were described as they happened in text messages that spread from mobile phone to mobile phone in New York City and beyond. The people sending and receiving the messages were using technology, developed by an anonymous group of artists and activists called the Institute for Applied Autonomy, that allowed users to form networks and transmit messages to hundreds or thousands of telephones.

Although the service, called TXTmob, was widely used by demonstrators, reporters and possibly even police officers, little was known about its inventors. Last month, however, the New York City Law Department issued a subpoena to Tad Hirsch, a doctoral candidate at the Massachusetts Institute of Technology who wrote the code that created TXTmob.

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The subpoena, which was issued Feb. 4, instructed Mr. Hirsch, who is completing his dissertation at M.I.T., to produce a wide range of material, including all text messages sent via TXTmob during the convention, the date and time of the messages, information about people who sent and received messages, and lists of people who used the service.

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Mr. Hirsch said that the idea for TXTmob evolved from conversations about how police departments were adopting strategies to counter large-scale marches that converged at a single spot.

While preparing for the 2004 political conventions in New York and Boston, some demonstrators decided to plan decentralized protests in which small, mobile groups held rallies and roamed the streets.

“The idea was to create a very dynamic, fluid environment,” Mr. Hirsch said. “We wanted to transform areas around the entire city into theaters of dissent.”