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Event has context ?
poll read, poll accept
Polymorphic events ? Event vs Inteface vs Object
Event vs. Message.
Process internal and external (remote or out of address space) events or messages.
Event is ? Situation when a message is received from the sender.
Sender call point. Signal ? Proxy ?
Receiver event catch point. Slot ?
Channel. Direct or queueing ?
Centralized loop polling points.
System signals or interrupts.
Code sending events.