practically a named pipe is like a "server-like" file where an application creates it and another can exchange data with the first one through normal write/read operations (like a normal file).
a typical named pipe has the path \\.\pipe\name_of_the_pipe
so in ventrcon you must simply launch it with this -F option, example:
Code:
ventrcon -F -a mypass 1.2.3.4
now you can send all the commands you want to the server simply writing them in the \\.\pipe\ventrcon file, example:
Code:
echo help > \\.\pipe\ventrcon
note that you can send/write any command you want but you can't read the server's reply (no, it's not a limitation of ventrcon indeed doesn't seem possible to write the data back in the named pipe file)