The NIC provided reference service to users (initially over the phone and by physical mail), maintained and published a directory of people (the "white pages"), a resource handbook (the "yellow pages", a list of services) and the protocol handbook. After the Network Operations Center at Bolt, Bernek and Newman brought new hosts onto the network, the NIC registered names, provided access control for terminals, audit trail and billing information, and distributed Request for Comments (RFCs). Feinler, working with Steve Crocker, Jon Postel, Joyce Reynolds and other members of the Network Working Group (NWG), developed RFCs into the official set of technical notes for the ARPANET and later the Internet. The NIC provided the first links to online documents using the NLS Journal system developed at SRI's Augmentation Research Center.