'Ejemplo posteado por Iñaki
'Proposito: Inutilizar el boton MINIMIZAR de la ventana 'madre' de Access
'El siguiente código iría en un módulo

Option Explicit

Private Declare Function GetSystemMenu Lib "user32" (ByVal hwnd As Long, ByVal bRevert As Long) As Long
Private Declare Function GetMenuItemCount Lib "user32" (ByVal hMenu As Long) As Long
Private Declare Function DrawMenuBar Lib "user32" (ByVal hwnd As Long) As Long
Private Declare Function RemoveMenu Lib "user32" (ByVal hMenu As Long, ByVal nPosition As Long, ByVal wFlags As Long) As Long
Const MF_BYPOSITION = &H400&
Const MF_REMOVE = &H1000&

Public Sub EliminaBotonMinizar(Frm As Form)
    Dim WinWnd As Long, Ret As String, RetVal As Long, lpClassName As String

    WinWnd = Application.hWndAccessApp
    If WinWnd = 0 Then MsgBox "Couldn't find the window ...": Exit Sub

    Dim hSysMenu As Long, nCnt As Long
    hSysMenu = GetSystemMenu(WinWnd, False)

    If hSysMenu Then
        nCnt = GetMenuItemCount(hSysMenu)
        If nCnt Then
            RemoveMenu hSysMenu, nCnt - 1, MF_BYPOSITION Or MF_REMOVE
            RemoveMenu hSysMenu, nCnt - 4, MF_BYPOSITION Or MF_REMOVE
            DrawMenuBar Frm.hwnd
        End If
    End If

End Sub

'========================================
'Para llamar a esta funcion, se puede hacer desde cualquier
'formulario y cualquier evento.
'Si yo deseo que nada mas arrancar la aplicacion, se me inutilice
'el botón minimzar de Access, creo un formulario de inicio a mi aplicacion
'y en el evento Open del formulario de Inicio pongo:

Private Sub Form_Open(Cancel As Integer)
 EliminaBotonMinimizar Me
End Su