You get to Advanced Passes by going to the DVR->Passes section of the Channels DVR web UI.
One of the things I find useful with Advanced Passes is you can pause them so they don't record.
I created a couple Advanced Passes that let me see what Movies or Shows are coming up on a channel.
For the Movies or Shows on Channel you can edit the advanced pass (while keeping it paused) and see the results of your editing immediately, like chaging the channel#.
I also have a couple that list all Season and Series Premieres.