The Lotus C/C++ API Toolkit for Lotus Notes and Domino documentation page lists product documentation for supported versions of Lotus C/C++ API Toolkit.
Additional documentation for the Lotus C API Toolkit for Lotus Notes and Domino versions 8.0 and later and the Lotus C++ API Toolkit for Lotus Notes and Domino versions 7.0 and later can be found with the toolkit.
See the developerWorks Lotus Developer Toolkits page.