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  - [Meet Mach](http://www.stepwise.com/Articles/Technical/MeetMach.html), a
    summary of Mach's history and main concepts.

  - OSF's [Kernel
    Interface](ftp://ftp.cs.cmu.edu/afs/cs/project/mach/public/doc/osf/kernel_interface.ps)
  - OSF's [Kernel
    Principles](ftp://ftp.cs.cmu.edu/afs/cs/project/mach/public/doc/osf/kernel_principles.ps)