LAHSO = Land And Hold Short Operation - I believe it means the controller doesn't need to treat the runways as intersecting or converging with regard to separation - because the pilot WILL? stop before he crosses the intersecting runway. If the pilot has to go around or overshoots, then the assumption that they don't intersect is blown! This compares to interleaving full length operations off of intersecting or converging runways, which goes pear shaped if the controller (or controllers) don't get the co-ordination right (or pilot doesn't hear/follow instructions) - which appears to have been the issue KLAS situation in the earlier link.