Is it just me or is Apple trying to claim a patent for pub/sub? See this article. According to this Apple is claiming a patent over
“A system in which a software module called an event consumer can indicate an interest in receiving notifications about a specific set of events, and it provides an architecture for efficiently providing notifications to the [event] consumer”
What is interesting is that the pretenders to Microsoft’s crown are now exhibiting the same kind of behaviour for which Microsoft used to be criticised.