说明：  在for DOS的C语言中，有一个system()函数，其功能是执行命令行程序，在VB中也有shell()函数，在Windows程序设计中WinAPI也为我们提供了类似的函数，它们就是WinExec()和ShellExecute()，下面就来讨论一下这两个函数的用法。
(In the C language for DOS, there is a system () function, and its function is to implement command-line program, in VB also shell () function in Windows programming WinAPI also provides us with a similar function, they are WinExec () and ShellExecute (), following on to discuss the usage of these two functions.)