Delphi防止程序多次运行，禁止一个程序多次打开，如图所示的程序中，同时只能运行一个实例，当你再次打开的时候会有弹出一个提示，你只能关闭这个提示，-Delphi to prevent the program is run multiple times, prohibit a program that repeatedly open, as shown in the program, but can only run one instance, there will be a pop-up pr