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synchronous messaging

 
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In a mock exam, I got the statement,
For synchronous messaging, message must be acknowledged before proceeding.
I think it is incorrect.
Any comments?
Best,
Denis
 
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A synchronous message is a method call or invocation. They are not acknowledged. A lot of these mock exams just plain suck.
 
Denis Wang
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thanks. I cannot agree more.
 
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