orsalak: Thanks nielsbauer! I had searched your manual and I only found the word abduct once:
"There are many different kinds of missions ranging from search & destroy missions and transport missions up to abductions and leading a whole fleet into battle." I'll search for the boarding section next.
By the way, I've been playing it today and I'm enjoying your game very much. I picked it up for only $2 here with the St. Paddy's sale, well worth it. I went ahead and bought it a second time from your site to show my support. I never would have known about it if I had not seen it on GOG though, some I'm glad you got it listed!
What I meant about the manual is that there is a chapter about boarding. Abducting is quiet automatic at this time after you´ve boarded the ship.