我是新手请回答清楚点~~谢谢！！
比如代码：Private Sub Picture1_KeyDown(KeyCode As Integer, Shift As Integer)
If KeyCode = 97 And Shift = 0 Then
Picture7.Visible = False
End If
If KeyCode = 98 And Shift = 0 Then
Picture6.Visible = False
End If
If KeyCode = 99 And Shift = 0 Then
Picture14.Visible = False
End If
If KeyCode = 100 And Shift = 0 Then
Picture13.Visible = False
End If
我想知道怎么样能让他后台响应按键消息，也就这个只可以在当前窗口使用~也就说怎么
让他在非活动窗口响应按键消息~~求高手教下我怎么代码该如何写~~~