Your OfferSubmission account is updated in real-time to show all new offers received for your listings and all of the seller's decisions as they happen.
You can see all activity by logging into the site and clicking "My Listings", then clicking the property ID# of the listing.
Additionally, you are notified via email whenever a new offer is received and whenever a decision is made by the seller. This means you only have to "handle" an offer once it's already accepted.