CreateFileMapping synchronous between programs?

Anybody with a writable view of the file can write to it at any time. If you want both editors to be able to reliably write out changes, you will have to perform your own conflict resolution where changes overlap.

One idea is that you could do the writes (and the FlushViewOfFile() call) while acquiring a named mutex (which you can create by calling CreateMutex() with a name parameter of non-NULL).

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