The volume of requests generated by various web clients differs. Some of them (esp. proxies) generate large numbers of requests, while others request only a few documents. Top-10 prefetching has been designed to adapt to these cases, and allow frequent users to prefetch lots of documents, while occasional users are allowed to prefetch few documents if any at all. Prefetching is controlled by the access profile of the client. This profile contains the number of documents the client has requested from each server in the recent past, in order to determine how many documents should be prefetched from each server in the future. This way, if the access patterns of the client change, Top-10 prefetching will follow the trend and start prefetching from the currently popular servers.