Is it possible, to use the same functions (e.g. 28002 for command "Up") simultaneously on a defferent set of keys?
Yes.
The point you seemed to have missed is in the name of the function you are trying to call.
28002 (MCC_
PLAYBACK_ENGINE_UP)
That function only works when the
Playback Engine is running, and you are displaying the media you are playing. Which means that it will bring up the OSD menu items and scroll through them. The command isn't a replacement for the Up, Down, Left and Right keys generally. It does not allow you to navigate the Theatre View menu, for example.
I inserted two of your commands as below, with the TranslateFlags="32" parameter to restrict them to the Playback Engine. All of these Hot Keys worked fine, when playing a video.
<Entry Key="Up" Command="28002" TranslateFlags="32" />
<Entry Key="Alt;I" Command="28002" TranslateFlags="32" />
<Entry Key="Down" Command="28003" TranslateFlags="32" />
<Entry Key="Alt;J" Command="28003" TranslateFlags="32" />
I then removed the TranslateFlags="32" parameter and they all still worked fine, but still restricted to the Playback engine.
<Entry Key="Up" Command="28002" TranslateFlags="32" />
<Entry Key="Alt;I" Command="28002" />
<Entry Key="Down" Command="28003" TranslateFlags="32" />
<Entry Key="Alt;J" Command="28003" />
I even added one of them as a Global Key, and it still worked fine, but only in the Playback Engine.
What are you really trying to do, and why?