Cumulus Support

As a user of another NZ sourced weather program, and having just studied "Cumulus" online I would like to evaluate it by running it on my main computer concurrently with my original program on the dedicated computer it resides on.
Problem! I use the rs232 connection at the moment to/from the station console and I don't believe it is possible to just parallel the two, Has anyone a positive suggestion please?

I'm not sure it's possible. You can get software 'splitters' to make one serial port look like two, but I don't know whether two programs would still tread on each other even using one of those. Search for 'serial port splitter'. I don't think they're cheap.