Primary Classification:
  H. Information Systems
  H.3 INFORMATION STORAGE AND RETRIEVAL
      H.3.3 Information Search and Retrieval

Additional Classification:
  B. Hardware
  B.8 Performance and Reliability
      B.8.0 General

  C. Computer Systems Organization
  C.2 COMPUTER-COMMUNICATION NETWORKS
      C.2.0 General

  H. Information Systems
  H.2 DATABASE MANAGEMENT
      H.2.1 Logical Design
  H.3 INFORMATION STORAGE AND RETRIEVAL
      H.3.4 Systems and Software
  H.4 INFORMATION SYSTEMS APPLICATIONS
      H.4.3 Communications Applications

  K. Computing Milieux
  K.4 COMPUTERS AND SOCIETY
      K.4.4 Electronic Commerce