Previous versions of Visual C++ did not support the standard C++ exception mechanism, and MFC provided macros TRY/CATCH/THROW which were used instead. This version of Visual C++ fully supports C++ exceptions. This note covered some of the advanced implementation details of the previous macros including how to automatically cleanup stack based objects. Because C++ exceptions support stack unwinding by default, this technical note is no longer necessary.
Please refer to Exceptions: Using MFC Macros and C++ Exceptions in Visual C++ Programmer's Guide for more information on the differences between the MFC macros and the new C++ keywords.