The secret screen is for debugging purposes. Specifically, it can be used for:
- Setting diagnostic messages. This identifies what specific stream was negotiated and what network speed it had detected. This generates a pop-up message when a movie is started. (The default is no diagnostic message.)
- Select a specific stream to use instead of selecting a stream based on the network speed it had detected. (The default is "auto select", which means it uses the best stream based on the network speed it detected.)
- With the 1.5 version of the software, select between "primary profile streams" (the old streams) and "advanced streams" (the new, better compressed streams). With the 1.5 version, "advanced streams" is the default. In versions of the software before 1.5, only "primary profile streams" could be used.