An application sits on a remote PC. The serial/parallel port on the remote PC then appears as a COM/LPT port on the local PC. The link should be able to run over a LAN, WAN or the Internet. In effect this application will simulate a standard serial or parrallel cable.
The source code must be made available so I can support this long term and the application needs to sit in a self conatined exe with no depandancies.
The remote application needs a key from the local end to active it and the activation will need renewing on a daily basis