Take the 2-minute tour ×  I'm currently working on notification
centers.  I read that there are 4 types of Notification Centers
are there.    1. NSNotificationCenter   2.
NSDistributedNotificationCenter   3. DarwinNotificationCenter
4. TelephonyNotificationCenter  In which NSNotificationCenter
I'm familiar with. TelephonyNotificationCenter is private and
not provided for developers.  My question is about
NSDistributedNotificationCenter and DarwinNotificationCenter.
What is the use of these two notification centers ? Is it
available for developers ? If available how can I use them ?
What I tried:    1. Googled, got two reference
(DarwinNotificationConcepts , NSDistributedNotificationCenter).
But confused after reading.   2. Read the iOS books available on
this link, get a overview. But nothing in details  Thanks in
advance  share|improve this question You are aware that
NSDistributedNotificationCenter and DarwinNotificationCenter are
not available in iOS (a least not to Apples documentation) – 
rckoenes Ja