I think that a refresher on the idea of "curing" rock is needed. I tried to keep it very simple, but if I am completely off base, I am sure someone who knows more than me will chime in.
Live Rock.
This is rock that has been taken directly from the water, and is allowed to remain wet during transport. It may have an number of organisms on it from, bacteria to algae, crustaceans, invertebrates, pods, mantis shrimp etc. etc. While many of these organisms are good, many are bad. Many of these organisms will die off during transport and when first introduced to your tank. The curing process allows all of these dead organisms to cycle. This can take any number of weeks to happen, and you will need to be guided by your test kits to see when it is done.
Base Rock
The best I can tell there are two types of base rock available. There is rock that was live and allowed to dry out, and rock that is mined from "land" that was not in the to distant past (geologically and otherwise) underwater.
Marco Rock, falls into the former category as it was allowed to dry out prior to shipping. This cuts down on shipping costs and storage costs at the distributors holding center. While all of the organisms (maybe with the exception of some bacterias and algaes) have died off, many have not had a chance to decay. Curing the rock allows everything to fully decay and cycle. Once again, it is test kit time. Curing this type of rock can take longer than Live Rock, as it does not/may not have a bacteria base to start off with.
Base rock that has been taken from a dry location, may still be nutrient rich and you will want to get rid of these nutrients . This usually involves "cooking" the rock. See below
"COOKING"
I hate the term and have to use it in quotes, as it is a misnomer that usually results in people sticking their rock in an oven. The theory/hypothesis goes something like this. "Cooking" rock, involves placing rock (live or base) into saltwater in a dark enclosed space with a small pump for circulation. No oven required. The goal, is to change the ecology of the rock from an algae driven system, which requires light, to a bacteria driven system which does not require light. The bacteria will use up nutrients that have "soaked" (again with the quotes) into the rock (such as nitrates and phosphates).
This can take a couple of weeks to months to happen. This will also result in the death of any and all photosynthetic organisms on the rock.
This can be done with both live rock and base rock.
Hope that helps, feel free to bash me if I am wrong or misguided.