WESTCHESTER PC USERS GROUP presents part one of a three-part series at Greenburgh Public Library on technology. Richard Nayman. president, will discuss new technology Sunday, March 15, from 2 to 3:30 p.m. Open to the public and free for all.

Part two will be a presentation on April 12 by Jimmy Iscaro on Adobe's Lightroom, a cross-platform program that will interest any photographer.

Part three on May 10 will be hosted by Pierre Darmon, who will give a lively presentation of IBM's Watson, the "Jeopardy winner.