Mm-hmm.
because you've got your general record anyway so if you  there's a programme on you want to put record on , that's fine , but if you do want to tape something in two days time and you're not sure if you're going to , you put the number in
Just whack in the number.
and it's just a number , it's not a date , it's not a time , it's not a channel , it's not when it finishes , it's not anything like that ,