If you do not know what Pipe Viewer is (I did not know about it until 5 minutes ago), then this blog does a good job giving a brief introduction to it with some examples. I writ
Cygwin has pv (Pipe Viewer) as an available package since I don't know when... but it is not installed by default.
If you have already installed cygwin, you can always add it later on by re-running the setup executable.