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(If the data are just a stream, without internal pointers to different parts of it, the data can be put into a straight VM chain, rather than a HugeArray. For example, an application that sends just text across would have no need of a HugeArray, but could simply use a VM chain of the text blocks. It would then pass a data format descriptor indicating the thing is an address book page in a VM chain, but the storage type descriptor would still be for a VM tree.)</P>
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The matter of which VM file should be