Supressing command window

I am making a GUI that runs CSound as a Windows system() command/process.

But when I click on my GUI for playing a .csd file, the command window (black screen - Csound messages) appears.

I want to supress it like it is in the Csound GUI that is distributed with the product.

I have used the -d flag, which is designed to supress displays, but this doesnt get rid of the command window.

How do I do this?

Thanks

David

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