NPR Digital Services is negotiating with an unidentified vendor to provide cloud-computing products to member stations, potentially transforming the ways they manage their membership programs and relationships with audiences. Bob Kempf, chief of the Boston-based NPR unit, would not identify the vendor, but acknowledges that NPR has been in close negotiations with roundCorner, a three-year-old company that specializes in designing customer relationship management (CRM) systems for nonprofit organizations. He aims to have a master services agreement with a third-party vendor in place by the end of the year, and launch a pilot program with as many as 10 stations in early 2013. NPR’s goal, he says, is to offer all member stations the opportunity to buy a license to a cloud-based, customizable CRM product later next year. “We are not building a single platform in the sky for stations to sign on to,” Kempf says.