that code has been out of use for many months. there is only one right now that allows you to change the order of you 'my playlist'.
I think it is still there, haven't tried it in a long time. that code is 'iamaedgecutter' as a keyword search, at the no results screen physically press menu and info on the boz at the same time.
Like I said, it doesn't do much and Im not sure if it is still there.
Slip, You see the programming FF ahead :30 secs.
Skip, the programming skips ahead :30 sec's., you don't see the programming.
Some like one way, other like the other way.
Personal preference.