WindowFromMouse - The handle of the window under the mouse cursor

Private Type POINTAPI
    X As Long
    Y As Long
End Type
Private Declare Function GetCursorPos Lib "user32" (lpPoint As POINTAPI) As Long
Private Declare Function WindowFromPoint Lib "user32" (ByVal xPoint As Long, _
    ByVal yPoint As Long) As Long

' Return the handle of the window under the mouse cursor.

Function WindowFromMouse() As Long
    Dim lpPoint As POINTAPI
    GetCursorPos lpPoint
    WindowFromMouse = WindowFromPoint(lpPoint.X, lpPoint.Y)
End Function