[visionegg] stimulus code outputs

The visionegg provides display capabilities, but what about output of
a stimulus code event to an external device.  For example, lets say we
present an image every 2 sec and there are 5 different categories of
image.  Each category is given a code, a number between 0-255.  Now,
we want to send this code to an EEG | MEG | fMRI system that will
record the timing of this event code during the acquisition of another
data timeseries.  It is simple enough to save a stimulus/event log to
a file, but it would be nice to interact with the serial/parallel port
also.  Is there a command like:

eventCode = 128 # or eventID (maybe event.id)
event.send.parallelport(eventCode)
event.send.serialport(eventCode)

I don't have any experience with sending codes to the serial/parallel
port.  Any tips or reading material would be really useful.

Best, Darren
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