dbus-1-doc 0.60-2ubuntu5 (amd64 binary) in ubuntu dapper

simple interprocess messaging system (documentation)
 D-BUS is a message bus, used for sending messages between applications.
 Conceptually, it fits somewhere in between raw sockets and CORBA in
 terms of complexity.
 .
 This package contains the API documentation for D-BUS, as well as
 the protocol specification.
 .
 See the dbus description for more information about D-BUS in general.