请教各位老师啊，关于前面键盘方面的代码我看不懂

explay23

我基?太差了，可以请哪位好心的老师，一句句讲我听听吗？
谢过了，你的不经意的辛苦对我真的好重要。。。。

Private Type NOTIFYICONDATA
    cbSize As Long
    hWnd As Long
    uId As Long
    uFlags As Long
    ucallbackMessage As Long
    hIcon As Long
    szTip As String * 64
End Type

Private Const NIM_ADD = &H0
Private Const NIM_MODIFY = &H1
Private Const NIM_DELETE = &H2
Private Const WM_MOUSEMOVE = &H200
Private Const NIF_MESSAGE = &H1
Private Const NIF_ICON = &H2
Private Const NIF_TIP = &H4
[em20] [em20]