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<H3> 7.12.6 In-Depth Explanation of AWS Architecture </H3>
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This section contains some information about the internal nature and
architecture of AWS.
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<H4> Signal, Slot, Sources Contract </H4>
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This section explains the contract between signals, slots, and sources from a
reference standpoint.
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A signal <EM>source</EM> maintains a list of <EM>slots</EM>. Thus, a source
maintains a list of references to each slot connected to it. A
slot maintains a list of <EM>sinks</EM> that it is connected to. The sink
manager keeps a list of sinks, and thus also keeps a reference to
each sink. Once a sink has been registered it cannot be
unregistered. This may be changed in the future, but it is
important to remember that a sink can not go away until all slots
bound to it go away. The same may be said for slots: a slot
cannot go away until the signal source it is connected to
disconnects. A slot may be disconnected from a signal source at
any time.
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