'DECLARACION DEL API
 Declare Sub mouse_event Lib "user32" Alias "mouse_event" (ByVal dwFlags As Long, ByVal dx As Long, ByVal dy As Long, ByVal cButtons As Long, ByVal dwExtraInfo As Long)
'Declare Sub mouse_event Lib "user32" Alias "mouse_event" (ACCION               , X               , Y               , ByVal cButtons As Long, ByVal dwExtraInfo As Long)
' ARRIBA DESCRIPCION DE LO QUE NECESITAS
' ABAJO ACCIONES
Const MOUSEEVENTF_LEFTDOWN = &H2
Const MOUSEEVENTF_LEFTUP = &H4
Const MOUSEEVENTF_MIDDLEDOWN = &H20
Const MOUSEEVENTF_MIDDLEUP = &H40
Const MOUSEEVENTF_MOVE = &H1
Const MOUSEEVENTF_ABSOLUTE = &H8000
Const MOUSEEVENTF_RIGHTDOWN = &H8
Const MOUSEEVENTF_RIGHTUP = &H10
 
'EJEMPLO
Private sub form_load()
'Click en X = variable "x", Y = variable "y"
mouse_event MOUSEEVENTF_LEFTDOWN, x, y, 0, 0
mouse_event MOUSEEVENTF_LEFTUP, x, y, 0, 0
End Sub