You want to know about your system, then read the manual. If none, then visit the maker's support website and locate your model# and check the specs. If anything at least open the system case and manually locate a SATA port.
As for dual OSes on a system, yes that's possible. BUT! you need to "install the OS" on that system NOT bring it over on a HD to it. Of course, you can just do it and find out via your results. Take one step at a time to reduce any hang-ups or issues and proceed. Because you want server OS to be running, that's not looking for a good match.
My computer has a IDE main drive with Windows vista Home premium Edition and I was wondering if I can install another Hard Drive through the SATA connector in the mother board with Windows server 2003 and later choose the booting disk when turning on the system. I know that this can be done if one OS is vista and the other is XP, but would windows server 2003 act like XP and cause no issues?
As of the installation method, I'm pretty aware of how to do it, but I have to locate the SATA connecter on the mother board if I have one!! I a HP a6330f Desktop that I bought in 2008 so I think the board is new enough to have a SATA port. Any idea where it is or how to know if I have one?