SketchUp C API is made for the C programming language: [ml]: http://extensions.sketchup.com/developer_center/sketchup_c_api/sketchup/index.html For C++ programmers ...
Single/double/triple click, use letter M to move Left & right drag (old box AND new box): select all you touch vs all that are completely contained Delete a line, delete a plane Scale - letter S - ...