Singleton Application

I want to make sure that my application is just running once on a single maschine. For this purpose I use 'Process.GetProcessesByName("AppName")'. If I get a Process-Object how can I execute a command within this object (f.e. open a form). I don't want to use remoting (to much overhead). I just want to start maybe a single function with a few parameters. Thanks Toni

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