[fpc-pascal] how to directly access field/record value of TBufDataSet?

[Dennis Poon]

Since TBufDataSet is in-memory, to speed things up, how can I directly 
access the N'th record and M'th field's value as Variant?

At this stage, I only need to read the value, no to write it.

Also, how do I use the     procedure LoadFromStream(AStream : TStream; 
Format: TDataPacketFormat = dfAny)?
Especially, I don't understand the TDataPacketFormat parameter.

Any help is greatly appreciated.

Dennis
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