delegate bool ConsoleCtrlDelegate(CtrlTypes CtrlType);

        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 ConsoleCtrlDelegate(CtrlTypes CtrlType);

static extern bool SetConsoleCtrlHandler(ConsoleCtrlDelegate HandlerRoutine,

delegate Boolean ConsoleCtrlDelegate(CtrlTypes CtrlType);

Private Declare Function SetConsoleCtrlHandler Lib "kernel32" (Handler As ConsoleCtrlDelegate, Add As Boolean) As Boolean

Private Delegate Function ConsoleCtrlDelegate(CtrlType As CtrlTypes) As Boolean