高手啊，高手，现身吧！我快不行了！！

'以下是隐藏window开始按扭的代码
Private Declare Function FindWindow Lib "user32" Alias "FindWindowA" (ByVal lpClassName As String, ByVal lpWindowName As String) As Integer
Private Declare Function ShowWindow Lib "user32" (ByVal hwnd As Integer, ByVal nCmdShow As Integer) As Integer
Private Declare Function FindWindowEx Lib "user32" Alias "FindWindowExA" (ByVal hWnd1 As Integer, ByVal hWnd2 As Integer, ByVal lpsz1 As String, ByVal lpsz2 As String) As Integer
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Dim H, FindClass As Integer
FindClass = FindWindow("Shell_TrayWnd", "")
H = FindWindowEx(FindClass, 0, "Button", vbNullString)
ShowWindow(H, 1)
End Sub
问题：
1.如果不用API，上面的代码应该怎样修改？
2.ClassName 是怎么知道的？比如Shell_TrayWnd,Button.
3.你又是从什么书上知道以上1,2两个答案的？