two responses - error code '4'?

[Meredith]

Hi there,
I'm getting a mysterious output during a MEG task, and I'm trying to
determine if it coming from the MEG-related equipment, or from E-
prime.

The task involves looking at a picture and making a single button
press response from amongst 3 button choices. The response is
registered through a port device which is a MEG-safe button box (can't
use the PST serial response box in the MEG machine).

The error arises when a participant accidentally pushes two buttons.
When this happens, we get a mysterious '4' appearing in our data. A
'4' never corresponds to any of the stimuli (numbered 6 to 255) or any
of the response codes (numbered 6,7, or 8), so it is a bit strange.

Have any of you encountered a '4' as some sort of error code? Is there
any way to avoid it?
Thanks,
Meredith
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