请高手指教API函数的翻议方法?
Public Declare Function SendMessage Lib "user32" Alias "SendMessageA" (ByVal HWND As Long, ByVal wMsg As Long, ByVal wParam As Long, lParam As Long) As Long

Private Declare Function CreateRoundRectRgn Lib "gdi32" _
(ByVal RectX1 As Long, ByVal RectY1 As Long, ByVal RectX2 As Long, _
ByVal RectY2 As Long, ByVal EllipseWidth As Long, _
ByVal EllipseHeight As Long) As Long
Private Declare Function SetWindowRgn Lib "user32" (ByVal HWND As Long, _
ByVal hRgn As Long, ByVal bRedraw As Long) As Long

Public Declare Sub ReleaseCapture Lib "user32" ()
Public Const WM_NCLBUTTONDOWN = &HA1
Public Const HTCAPTION = 2

Private Declare Function SetWindowPos Lib "user32" (ByVal HWND As Long, ByVal hWndInsertAfter As Long, ByVal X As Long, ByVal y As Long, ByVal cx As Long, ByVal cy As Long, ByVal wFlags As Long) As Long
小弟在学习前辈的实例时看到了上面一堆API函数,在VB自带的API文本浏览器中可以查到以上语句,但是不知怎么理解和使用,请高手们告知具体的学习之方法!小弟在此谢过各位