it is a fancy autoit script :/ but it will have potion usage/ death checks. perhaps it would be better if i explain exactly what the bot does.
first you need a main character that is lvl 60 in alright gear (act 4 hell/act 1 inferno) this character farms the first boss of act4. runs up does the scripted event, and engages the event. at roughtly 30% of the bosses HP the masterbot tells the drones to join his game. they do, boss dies.. EXPERIENCE! and then log out and wait for the master bot to tell them to join him again.
its rather simple but it works relatively flawlessly.
the only things to note is that diablo must be killed with each drone account so that they may enter the next difficulty (25+=nightmare 50+= hell)
the programming uses continual screen scans to tell if it missed an event (ie it went to talk to tyriel and ****ed up) or to check its HP ( if less then 50% use healthpot)
i have now used this script on 9 different alternate accounts with the same main account. never had any issues, always less then 21 hours to get all toons to 60 (i believe the average is around 19 hours) .
as for the more complicated bots. i would love to undertake such a project, but i am still learning, and personally i would never put a product out there that i wasnt absolutely sure would be safe for people to use and directly reading/writing to ram is a little above my current understanding of programming. so until i've had a while to perfect any sort of protection. im going to stay away from making such invasive programs.