. ▁In ▁some ▁cases , ▁users ▁no ▁longer ▁needed ▁a ▁D NC ▁" ex pert " ▁to ▁implement ▁shop ▁floor ▁networking , ▁and ▁could ▁do ▁it ▁themselves . ▁However , ▁the ▁task ▁can ▁still ▁be ▁a ▁challenge ▁based ▁on ▁the ▁C NC ▁Control ▁w iring ▁requirements , ▁parameters ▁and ▁NC ▁program ▁format . ▁ ▁To ▁remain ▁compet itive , ▁therefore , ▁D NC ▁companies ▁moved ▁their ▁offer ings ▁up market ▁into ▁D NC ▁Network ing , ▁Sh op ▁F loor ▁Control ▁or ▁S FC , ▁Man ufact uring ▁Exec ution ▁Systems ▁or ▁M ES . ▁These ▁terms ▁en comp ass ▁concepts ▁such ▁as ▁ ▁real - time ▁Machine ▁Mon itor ing , ▁Graphics , ▁Tool ▁Management , ▁Tra vel er ▁Management ▁and ▁Sch ed uling . ▁Instead ▁of ▁merely ▁acting ▁as ▁a ▁repository ▁for ▁programs , ▁D NC ▁systems ▁aim ▁to ▁give ▁operators ▁at ▁the ▁machine ▁an ▁integrated ▁view ▁of ▁all ▁the ▁information ▁( both ▁text ual ▁and ▁graph ical ) ▁they ▁require ▁in ▁order ▁to ▁carry ▁out ▁a ▁manufact uring ▁operation , ▁and ▁give ▁management ▁tim ely ▁information ▁as ▁to ▁the ▁progress ▁of ▁each ▁step . ▁D NC ▁systems ▁are ▁frequently ▁directly ▁integrated ▁with ▁corpor ate ▁C AD / C AM , ▁ER P ▁and ▁Computer - a ided ▁Process ▁Pl anning ▁C APP ▁systems . ▁ ▁Special ▁protocol s ▁ ▁A ▁challenge ▁when ▁inter f acing ▁into ▁machine ▁tools ▁is ▁that ▁in ▁some ▁cases ▁special ▁protocol s ▁are ▁used . ▁Two ▁well - known ▁examples ▁are ▁Maz ak ' s ▁Maz