求sql语句解释

Private Sub Text2_KeyDown(KeyCode As Integer, Shift As Integer)
If KeyCode = vbKeyReturn Then
Cmd1.Visible = True
Cmd1.SetFocus
End If
End Sub

这段语句是什么意思，麻烦哪位高手解释一下。谢谢

Private Sub Text2_KeyDown(KeyCode As Integer, Shift As Integer) '响应Text2的KeyDown事件
If KeyCode = vbKeyReturn Then '如果按下的键是回车键
Cmd1.Visible = True '把Cmd1显示起来
Cmd1.SetFocus '把焦点放到Cmd1上
End If
End Sub