Biopac markers and triggers

[wells at mail.utexas.edu]

How can I send markers and triggers to Biopac?  That is, should there be an
inline object that sends the marker or trigger?  If so, what should be in it?

Just to make sure I'm being clear... by "marker" I mean just sending a marker to
Biopac to mark when something has happened.  By "trigger" I mean letting Biopac
know when to start and stop recording.

Also, if it helps we're using Biopac systems MP150 with a STP100C interface. 
Thanks!

  - Tony Wells