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This was never really added for external users. It was more of
a debugging feature and therefore it was never added to all of
the API calls. The way around this is to turn off the message
box displays just before calling either of these API calls (by
calling SuppressInternalBoxes). As for data size, internally
we always max out to twice the memory of the data recorder
(128 Kb - so we allocate 256 Kb).