Public Declare Function FindWindow Lib "user32" Alias "FindWindowA" (ByVal lpClassName As String, ByVal lpWindowName As String) As Long; construyes una aplicacion aparte o si quieres ahi mismo que cada intervalo de tiempo determinado le ponga el foco a tu aplicacion:
Public Declare Function SetFocus Lib "user32" (ByVal hwnd As Long) As Long