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Automation with C++

Automating word
msdn

EXCEL

XLCLIENT demonstrates how to control Microsoft Excel using OLE Automation. The MFC directory contains a sample that uses MFC. The SDK directory contains a sample that does not use MFC.
On msdn, one can also find a file named invhelp.cpp (and invhelp.h) that helps calling IDispatch

The office object model

See the office object model