Because the request list may quickly fill up with a large amount of songs, you
can enter words that you are especially interested in, in the highlight field
in the window. When a song in the list contains one of the words it's highlighted
in red color in the list so it's easier to see.
If you want to only retain songs in the list for a certain amount of time,
you can specify a timeout value in minutes in the General
preference panel. The song is then automatically removed from the list after
that period of time.