If you are writing an application or game that allows starting with special parameters on the command line, you can use this command to retrieve the parameters.
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For example, you might want to start the program with a debug variable set so you can track stuff during execution. So, you could offer the ability to run the executatble with a /debug parameter. If they execute the program with the parameter, then you can set a flag inside your game.
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To simulate the command line passing in the editor, select PROGRAM->PROGRAM COMMAND LINE from the pulldowns and enter a value to be passed at runtime.