Prohibit running multiple instances of Delphi program, the program first initialization parameter, then judge whether the program is already running, get the program handles, if found more than one handle, just run a handle, the procedure can always keep a window.

禁止运行程序多个实例\Project1.dpr
....................\Unit1.dcu
....................\Unit1.ddp
....................\Unit1.dfm
....................\Unit1.pas
禁止运行程序多个实例

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