I'm not sure whether what you want is to suppress the confirmation dialogs, or all system interaction with the user.
To suppress the confirmation dialogs, use the GetOption method to save the current value of the "Confirm Action Queries" option, then use SetOption to turn it off. When you're done with your RunSQL, restore the original option value with SetOption again.
To turn off all interactions, use DoCmd.SetWarnings False before the RunSQL, and DoCmd.SetWarnings True afterward. Rick Sprague