What are all the controller commands and task commands that get invoked starting from the AddToCart -> ShoppingCart -> CheckoutSignIn -> ShippingInfo -> ShippingMethod -> PaymentMethod -> Order Summary (basically navigating from the Shopping Cart page to the Order Summary page)? This may be a big question...Are there any links that may provide such an answer?
I think that link will answer to you question. (scroll down under diagram)
You can also take a loot on that page : http://publib.boulder.ibm.com/infocenter/wchelp/v7r0m0/index.jsp?topic=%2Fcom.ibm.commerce.developer.doc%2Frefs%2Frosordtaskcmdscont.htm
Hope you'll find your answer.
Regards, Jimmy.