This is a useful tool for building brick racks.
It maps the numpad 1-9 keys (except 5) to the appropriate arrows on the build menu, and clicks them twice.
The numpad 0 key is used to click the build button, if you position the projects menu correctly, you can also use it to start building a new one.
Numpad . is used to press the cancel button.
ctrl-e exits the macro.