// http://pinvoke.net/default.aspx/kernel32/HandlerRoutine.html

        ConsoleCtrlDelegate HandlerRoutine,

This is defined elsewhere as the 'ConsoleCtrlDelegate' : http://pinvoke.net/search.aspx?search=ConsoleCtrlDelegate&namespace=[All] but if you are searching for the Microsoft Terminology name, you'd be calling it the HandlerRoutine

   delegate bool HandlerRoutine(CtrlTypes CtrlType);

Declare Function HandlerRoutine Lib "kernel32.dll" (TODO) As TODO

static extern bool SetConsoleCtrlHandler(ConsoleCtrlDelegate HandlerRoutine,