Source

Trace to output window without adding code.

Want to trace some run-time data to the output window while debugging without changing and recompiling your code?  Use Tracepoints: http://blogs.msdn.com/saraford/archive/2008/06/13/did-you-know-you-can-use-tracepoints-to-log-printf-or-console-writeline-info-without-editing-your-code-237.aspx

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