current buffer: a yielder of buffers. Yields the list of
messages that have appeared in the buffer, but which have not yet been
removed. The messages are listed in the order of their arrival in the
buffer.
OBS:This yielder is not implemented by the action interpreter.
performing-agent: a yielder of agents. Yields (the
identity of) the agent that is performing the enclosing action.
OBS:This yielder is not implemented by the action interpreter.
contracting-agent: a yielder of agents. Yields (the
identity of) the agent that offered the contract to the performer.
OBS:This yielder is not implemented by the action interpreter.
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