demonstration of how the procedure can only run one process, if the procedures a...

代码说明：

演示了如何让程序仅仅只能运行一个进程，如果程序已经运行，再点exe就会激活原来已经运行的那个进程。-demonstration of how the procedure can only run one process, if the procedures are already running, then points exe will activate the original operation of that process.