Windows IPC Using Shared memory

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Let me rephrase the question:-
Say process A and B.

1. 'A' creates named shared memory (CreateFileMapping)
2. 'B' opens shared memory (OpenFileMapping)
3. 'A' terminates abnormally. Or lets say it just exits properly.

Consider situations in which Process A can "NOT" signal process B that it is terminating.

-->Does the memory persist? If so, for how long?
-->What does Process B expect to face here.

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Hello,
I may be repeating a question or should have known but searching through various blogs hasn't yet made me understand.

I am creating an IPC application where one process creates a shared memory and the other process accesses it.
Both processes are going to read/write into it. Threads and synchronization is being taken care.
The question I have is that what happens to the memory when the creator crashes abnormally.
1. What do I expect when the creator crashes?
2. Will the accessing application face a "bad pointer"/ access violation?
3. Will it be accessible forever or go bad at some later point of time?

I in fact want the accessing application (which opens view to file) to get to know immediately so that it can do the business logic I need to do at the upper layer.

Please let me know or point me to some source of information.

Thanks!!