This is the issue with any voice control -- we don't yet have a standard vocabulary.

For physical remotes or the 3rd party remotes that we cook up to emulate the native remotes, "Up", "Down", "Left". "Right", "Play", Pause", "Stop", the numeric keys, and similar are fairly straight forward. While the exact meaning of "<", "<<", "|<<" can be a little fuzzy (varies from unit to Unit to unit), they are physically grouped together and everyone quickly figures out that they are transport commands. In voice we have some choices to work through: "Back", "Previous", "Rewind", "Last Track", "Last Channel", "Skip Back", "Back 10 seconds", "Replay", "Back to beginning", etc.

Things also can get a little fuzzy with the "Enter", "OK", and "Select" keys because "Enter" might not be the same as "OK", but the physical grouping will help keep their functions separated. "OK" in the center of a cursor cluster is fairly obvious. "Enter" as part of a numeric cluster is not so obvious. (And, even on native remotes, "Enter" is not always equivalent with "OK".) With voice one must be literal and "literal" will be different from manufacturer to manufacturer.

In one voice control scheme one had to be careful to keep "on" and "in" separate on one's mind because "on" referred to something in my house, but "in" tended to reach out to a local movie theater. "Can't find a theater called Kitchen in [MyTown]" would be a response.