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XXX copy in a well-written existing definition here

A capability is a reference which combines designation with authority.

Designation is ...

Authority is ...


  • Object references in object-oriented programming languages, provided that they have encapsulation and do not have other ways to acquire references (XXX explain or move to page on Object-capabilities)
  • capabilities, or "keys", in capability operating systems such as KeyKos, CapROS, or Coyotos
  • an Actor address + an facet identifier? (XXX what is this?)

See also

(XXX improve this section)

See What is a Capability, Anyway? for a partisan explanation of what capabilities actually are.

See also Overview: Capability Computation

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