Real-Time score input under Windows

Using CSound5 under Linux, I am able to send real-time score input to stdin and get sound as the score events are read. Using the same technique under Windows, the sound is not produced until I close the input stream. The Windows command line looks like this:

my_program | csound -g -L stdin -h -o devaudio orchestra.orc dummy.sco

Dummy.sco looks like this: "f 0 120000"

Any hint here how to get the sound output as the score events are read in?

If not, any hint who is the right party to ask, or where to post?