C# Definition:

private delegate IntPtr LowLevelMouseProc(int code, WindowsMessages wParam, [In] MSLLHOOKSTRUCT lParam);

VB Definition:

Private Delegate Function LowLevelMouseProc(ByVal code As Integer, ByVal wParam As WindowsMessages, <[In]> ByVal lParam As MSLLHOOKSTRUCT) As IntPtr

User-Defined Types:

MSLLHOOKSTRUCT

WindowsMessages

Notes:

If the hook returns >0 then no subsequent processing occurs.