PrevInst - Two samples, the first a simple one showing how to use WM_COPYDATA to send the command string received by an application to a previously running instance of that application.

• 这个项目包含了两个例子，第一个简单地演示了如何使用WM_COPYDATA来发送一个应用程序收到的命令字符串到这个应用程序以前运行的实例中。