multi-note triggering & routing

Hello,

I've got two questions:

- I would like to send a start MIDI message (0xfa) to a device when a
  certain accord is played

1. how can I trigger on multiple note-keys pressed at almost the same
   time?

2. how can I make sure that a trigger-message (e.g. 0xfa) is sent via a
   certain MIDI-port? Like with a midiman 2x2 that has multiple OUT-
   ports.


Regards.