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Important This document may not represent best practices for current development, links to downloads and other resources may no longer be valid. Current recommended version can be found here.

Include Files for Multithreading 

Standard include files declare C run-time library functions as they are implemented in the libraries. If you use the Full Optimization (/Ox) or fastcall Calling Convention (/Gr) option, the compiler assumes that all functions should be called using the register calling convention. The run-time library functions were compiled using the C calling convention, and the declarations in the standard include files tell the compiler to generate correct external references to these functions.

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