They are referring to things like SKY, where it was a zone you go go into. 3 to 20 linkshells (FC's of ffxi) would be in there all fighting over the same 4 or 5 pop trash mobs so they could farm the pop items they needed to spawn the Bosses in the zone. Where you spent hours a day trying to just claim a pop trash mob from another Linkshell. And linkshells actually had people that just wondered out specifically to claim pop trash mobs from other linkshells. You also camped other linkshells on NM's so that if they wiped you could claim it from them.... Same thing on world bosses like fafnir where linkshells would camp in the event the LS that got the claim would wipe. And linkshells would claim stuff, then kite it around the zone while they made phone calls and the rest of their Linkshell logged on etc.

If you like that kind of competition.... But I don't miss it.