Can i hook my cable box to my home network lan?

I noticed my new 4640hdc cable box has an Ethernet port. The owners manual says this can be used to hook to a lan for "advanced services with retail purchased devices." The charter communications reps swear this is incorrect but frankly i don't believe them. I am looking to maybe use my PC as a dvr or even use my tablet as a remote control like fios does with the ipad. Anything is possible right? Any info is helpful.|||No, Charter approves of what the OS on the STB can do. If they haven't authorized any services to use the Ethernet port, it won't do anything.