yes it is possible, you need 3 sets of cdkeys and a faster computer (fast internet connection)
--> i have ran 3 pindle bots at once and i am on a Pentium Celeron 400 mhz processor (VERY OLD) with only 256 mb of memory. it lagged pretty bad but it was still able to kill pindle with all three bots (although the run's were longer and it lagged a bunch)
it IS possible to have up to 4 bots running at once with a fast cpu and good graphics card. Test it and see if you computer can handle 3 bots.
once you get past 4 bots, they always disconnect because your internet connection most likely cannot handle all the data transfer.