Hello,

I'm not 100% certain, but based on the names, I would assume they are options used internally in the development of the PegaPlatform itself. I don't know exactly in what way they are handled differently than other activities, but no doubt the engine generates slightly different java so that they behave the way a Validate or Assembler activity needs to behave. For instance, I know triggers don't commit database transactions, so if you need an activity that doesn't do that, they are  a good choice. I would say if you don't understand the differences in behavior, it's probably best not to use them so as to avoid surprises.

Thanks,
Mike