Hi Aitor, the topic reminds me that we have https://www.ibiblio.org/pub/micro/pc-stuff/freedos/files/util/system/triple-dos/ in our archives - it is 20 years old and rather limited, but it might still provide some inspiration somehow :-) Regards, Eric
Under DOS-Shell, there was the DOSSWAP to do the task switching. But quite a different approach from multitasking, specially the preemptive way that appeared with Win386 (the VMM). Unfortunately, for the simplest (and useful) easier uses, I do not know of a free DOSSWAP replacement. I assume that such software would make copies of DOS and BIOS global variables (such as the list of lists) and swap them upon a task switch.
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