A,B 两个应用程序,在A中向B发送一个回车如何发送

A,B 两个应用程序,在A中向B发送一个回车怎么发送?
vb编程,A,B   两个应用程序,在A中向B发送一个回车怎么发送?

仅仅只要给B窗口一个回车就可以了,不需要其他操作

------解决方案--------------------
使用

Private Declare Function SendMessage Lib "user32 " Alias "SendMessageA " (ByVal hwnd As Long, ByVal wMsg As Long, ByVal wParam As Long, lParam As Any) As Long


Private Declare Sub keybd_event Lib "user32 " Alias "keybd_event " (ByVal bVk As Byte, ByVal bScan As Byte, ByVal dwFlags As Long, ByVal dwExtraInfo As Long)