Since the release of zhrenk's most recent multiclient happened to happen with an already running level up event,most of it's users were using it for boosting their lowbies,and most of these people make very dangerous mistakes that may cause their ban and ALWAYS causes the patching of the hack.
I am aware that there's -currently- no working multiclient hack for the DN SEA patch v.151 but this is for any future multiclienting as I have spotted many people and easily recognised them as multiclient hackers,and I believe it wouldn't be hard for a GM to spot them as well.
So here are the mistakes I have noticed the most:
1-Naked/Beginner-geared characters,ridding a char of it's weapon means it will keep running fast even after being hit,most users leave their characters like that even after leaving the dungeon,which doesn't make much sense even if you were being boosted by a different person ESPECIALLY WHEN YOU ARE AT A MUCH HIGHER LEVEL THAN YOUR EQUIPMENTS,be sure to gear your character with at least +0 magic grade gears of the current level,you can find these at the dungeon you're grinding
2-Having your characters look related in any way,and no this has nothing to do with visuals,it's about the Name,Guild and Titles,staying in town with similar characters is extremely dangerous as the a GM might spot you and suspect something,so always be sure to give your characters very different names especially if you were going to put them in the same guild for the bonus EXP,you can also make your booster character guild-less so no one will suspect a thing
3-STAYING IDLE ANYWHERE is the best way to get spotted,GMs seems to know when a 2 or more party members are "Away" in a dungeon/stage zone,they probably check In-party Idle characters in stage entrances and dungeons only since they can't ban someone for being AFK in town,so don't do that as they will most likely note your IP and search for other clients with the same IP which is basically getting caught red red red handed
4-Awkward appearances with your own characters in town,unless you are a pro meepo,you'll look very weird with a train of people following you,or your "friends" only moving when you're idle or walking in a straight line (auto-walking),so try and Make a party with any of your characters and summoning the rest with it
The user in the above picture has basically made all of the mistakes by leaving their two characters of the same class,same look,same guild,one-letter-different-names,no weapons and still wearing lv1 Beginner items at Lv19 together at very close spots in TOWN
As mentioned before these mistakes can lead to a 20-year ban for your account and the new patch,patching the current hack.
Just try and do as the green text says and you should be fine.
Happy hacking and Thanks for sharing your stuff with us,zhrenk and other hacklords out there