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#22 11:16:00

• The paradigm shifts involved
  
  
  • Spool: move away from a single, local spool, to a remote NNTP model
    
    
    • Spool becomes the major big ticket item in this model, and may be shared among many reader machines (even across WAN links)
      
      
    • Downside: history lookup becomes a potential bottleneck, as all article operations now involve a history lookup, although new techniques are substantially less demanding than traditional history mechanisms