“Advanced Functions” on RTI/DVD

Hello guys, I am now also proud owner of an RTI/DVD with TV (orignal SÖT-elchhalterung). at some point I have read something about the “extended menu” or the “extended functions” of the RTI, can unfortunately find the info nowhere more. if I’m not wrong, it was the keyboard sequence BACK ENTER BACK when driving up the navis, or ? thank you and gruesse Roman