GPS Serial Input ?

[pdxsailordiver]

I am running opencpn (1.3.6) on my laptop with windows XP. My GPS is a standard Horizon, the GPS out goes to my VHF for DSC. So I have 2 questions
1. Can I use the GPS output for both the VHF and laptop(at the same time)?
2. Which pins of the 9 pin serial conector do I use as the input?

Thanks to those who wrote the program.
Tim
S/V Maria Victoria
cascade 42