Dish Pass is the global search for events to place in your timers automatically. Dish Pass uses either the title or the the title and info text for a search string that you enter using the keypad displayed on screen. Some of the best ways to use Dish Pass are to enter an actor's name in the search string, and Dish Pass will record every instance (movie, TV program) where that name appears in the info.
Another good use is that you know the name of a movie that you want to record and watch when it comes to TV. So, you enter the name of that movie or TV show, and when one of the channels finally air it months from now, it will automatically be recorded without your having to do anything else. Dish Pass can be limited to search only one channel for your string rather than all the channels. Of course, by now, you can see the the any search string, any words or names that you can fit in the display can be used to match what you are looking for.
Be careful with Dish Pass, however. If you enter too broad a string (Made for MTV's reality show Made) or something that is found on many channels (News, for example) or too common a name, you will overwhelm and max-out your timers and get a ton of recordings you never wanted.
You can un-officially use Dish Pass as a kind of specific search limited to one channel. Just remember to immediatly erase the timers created if you use it in this un-official way.