What is a task?

• Subject: What is a task?
• From: Bob Ueland <email@hidden>
• Date: Sat, 20 Oct 2007 06:23:09 -0700 (PDT)
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In 'NSNotificationCenter Class Reference' it says:



Each task has a default notification center.




I wonder what a task is?



In  
'Multithreading Programming Topics' it says:


In Mac OS X, each process (application) is made up of one or more threads. ...Threads let your program perform multiple tasks in parallel.... Each
thread has its own execution stack and is scheduled for runtime
separately by the kernel. 


From the above description it is clear what a thread is. But what is a task? Can a thread have several tasks with each task having its own default notification center?

Bob




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