6.3版好象是用事件驱动的:
//////////////////////////////////////////////////////////////////////////////
//
// 函数: OnFirstUIBefore
//
// 事件: FirstUIBefore event is sent when installation is run for the first
// time on given machine. In the handler installation usually displays
// UI allowing end user to specify installation parameters. After this
// function returns, ComponentTransferData is called to perform file
// transfer.
//
///////////////////////////////////////////////////////////////////////////////

OnFirstUIBefore()是在某台电脑上第一次运行安装时执行.

//////////////////////////////////////////////////////////////////////////////
//
// 函数: OnFirstUIAfter
//
// 事件: FirstUIAfter event is sent after file transfer, when installation
// is run for the first time on given machine. In this event handler
// installation usually displays UI that will inform end user that
// installation has been completed successfully.
//
///////////////////////////////////////////////////////////////////////////////
OnFirstUIAfter()在文件复制结束后运行.