C# Constants:

public const IntPtr HWND_BROADCAST = new IntPtr(0xffff);
public const IntPtr HWND_TOP       = new IntPtr(0);
public const IntPtr HWND_BOTTOM    = new IntPtr(1);
public const IntPtr HWND_TOPMOST   = new IntPtr(-1);
public const IntPtr HWND_NOTOPMOST = new IntPtr(-2);
public const IntPtr HWND_MESSAGE   = new IntPtr(-3);

VB Constants:

Public Const HWND_BROADCAST As IntPtr = New IntPtr(&HFFFF)
Public Const HWND_TOP As IntPtr       = New IntPtr(0)
Public Const HWND_BOTTOM As IntPtr    = New IntPtr(1)
Public Const HWND_TOPMOST As IntPtr   = New IntPtr(-1)
Public Const HWND_NOTOPMOST As IntPtr = New IntPtr(-2)
Public Const HWND_MESSAGE As IntPtr   = New IntPtr(-3)

Notes:

Used in SendMessage API