In tip 2996 » How do I prevent a command from displaying any output, including any error message, I explained that using 1>nul 2>&1 would pipe both Stdout and Stderr to nul, suppressing any output from the piped command.

I also pointed out that > defaults to 1>.

Using these principals, you can save a keystroke when attempting to suppress Stdout and Stderr by using >nul 2>&1 or 2>nul >nul.