Thread Subject: mxArray ou mwArray?

Hello,

what is the main difference between mxArray and mwArray?
I was seeing this technical solution
"How do I create a C/C++ shared library with MATLAB Compiler that can
be used in a Microsoft Visual C++ 2005 project using Windows Forms
Application"?:

web('http://www.mathworks.com/support/solutions/en/data/1-2QTWCE/
index.html?solution=1-2QTWCE')

It's for C++, but it use mxArray?...

Thanks