Thanks you!
more need to keep in mind!
DS / LHC = ALL THE PS, EVEN WITH DS OR WITHOUT DS, THEY MUSH HAVE A FILE CALL LHC FILE, THIS IS A SUB-SET OF DS. SO IF THE SERVER LOST CONNECT TO THE DS, THEY STILL CAN WORK WITHOUT DS FOR 4 DAYS, REMEMBER DO NOT RESTART THOSE PS SERVER.
DC / ZONE = IN A FARM, THEY MUCH HAVE ONE DC, BUT IF YOU SET UP MORE THAN ONE ZONE, SO EACH ZONE MUST HAVE ONE DC.
ALL THE CITRIX ADMIN MUST KEEP IN MIND THAT.