[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?
>
> Simply said: You cannot.
>

Can any one suggest an in-memory dataset in fpc/lazarus that allows 
direct access?

Does TMemDataset allow it?

Thanks.

Dennis