See a collection of capability patterns.

• To Rescind or Revoke
• Muxing and Demuxing a stream
• Synchronization
• The Join object
• Simplex Signal Streams
• Vetting and Vouching

Unripe Proto Patterns (strainig the domain state model)

• Impetus (unripe)
• Delayed Responses (unripe)
• Select from Unix
• Pushy (not Keykos Compatible??)
• IPC

Vulnerabilities in Synchronous IPC Designs is an interesting paper that raises and solves some novel problems.