I wouldn’t say MOST support computer keyboard playing, but anyway — this does not look like its keyboard to midi, it seems more like midi translation (as in, a MIDI input is output as a different MIDI function) not entirely sure.
What you want is Virtual MIDI Piano Keyboard: http://vmpk.sourceforge.net/ open source.
Of course if you have 50-60 bucks a better route would be a midi keyboard
http://www.akaipro.com/lpk25
http://www.korg.com/nanoseries
http://www.amazon.com/M-Audio-E-Keys-37-MIDI-Keyboard/dp/B0001A9C5I