usefull links: http://www.rei-labs.net/connecting-multiple-virtual-serial-ports-together/3/ http://com0com.sourceforge.net/doc/UsingCom0com.pdf
commands:
$hub4com --octs=off --no-default-fc-route=All:All --route=0:all --route=1:all \\.\CNCA2 \\.\CNCA3 \\.\CNCA4 \\.\CNCA5
(Serial port or com port? - Serial ports are often refered as COM ports. It is the same to be short. You can read abut it in the Wiki article )