Difference between Critical Sections over Mutex objects

[C++ Programming]

Hi all,

I have seen two difference,

1. Critical Sections are relatively faster than Mutex. That is synchronizing with the same process, is more efficient.
2. Mutex could be used with cross-process thread synchronization.

So I have two questions,

1. Am I correct?
2. Any other points on this?

Your comments are really appreciate.
I appreciate your help all the time...
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