Yeah thats quite easy if you search the web for Port.dll
then you add some funtions to a module in your VB Project and then you can youse them easily . Yeah you have free access onto the Handshake lines e.g. CTS RTS a.s.o
Somewhere ihave found this dll with a nice description
ithink it was on a Germanpage where ..
yeah i think it was
http://home.t-online.de/home/B.Kainka/msrwin.htm
Good luck