Self Closing Message Box

'Add a module to your project (In the menu choose Project -> Add Module, Then click Open)
'Insert the following code to your module:

Public Const NV_CLOSEMSGBOX As Long = &H5000&
Public Declare Function SetTimer& Lib "user32" (ByVal hWnd&, ByVal nIDEvent&, _
ByVal uElapse&, ByVal lpTimerFunc&)
Public Declare Function FindWindow& Lib "user32" Alias "FindWindowA" _
(ByVal lpClassName$, ByVal lpWindowName$)
Public Declare Function LockWindowUpdate& Lib "user32" (ByVal hwndLock&)
Public Declare Function SetForegroundWindow& Lib "user32" (ByVal hWnd&)
Public Declare Function MessageBox& Lib "user32" Alias "MessageBoxA" _
(ByVal hWnd&, ByVal lpText$, ByVal lpCaption$, ByVal wType&)
Public Declare Function KillTimer& Lib "user32" (ByVal hWnd&, ByVal nIDEvent&)
Public Const API_FALSE As Long = 0&
Public Sub TimerProc(ByVal hWnd&, ByVal uMsg&, ByVal idEvent&, ByVal dwTime&)
KillTimer hWnd, idEvent
Dim hMessageBox&
'Replace 'Self Closing Message Box' with the title you gave to your message box.
hMessageBox = FindWindow("#32770", "Self Closing Message Box")
If hMessageBox Then
Call SetForegroundWindow(hMessageBox)
SendKeys "{enter}"
End If
Call LockWindowUpdate(API_FALSE)
End Sub

'Insert this code to your form:

Private Sub Form_Load()
'Replace the '4000' below with the number of milliseconds the message box
'will appear. 1000 milliseconds = 1 second
SetTimer hWnd, NV_CLOSEMSGBOX, 4000&, AddressOf TimerProc
Call MessageBox(hWnd, "Watch this message box close itself after four seconds", _
"Self Closing Message Box", MB_ICONQUESTION Or MB_TASKMODAL)
End Sub