Microsoft Knowledge Base Article 903234 contains the following summary and introduction:

SUMMARY

An update is available to add support for the Microsoft Data Protection Manager End User Recovery feature to the Volume Shadow Copy Service client. The Volume Shadow Copy Service client may also be referred to as the "Timewarp" client.

After you install this update, the updated Volume Shadow Copy Service client can recover data from a Data Protection Manager server if a Data Protection Manager server is available.

INTRODUCTION

This article describes an update that is available for the Volume Shadow Copy Service client. This update is available for Microsoft Windows Server 2003 and for Microsoft Windows XP. This update performs both the following actions:

This update adds support for the Microsoft Data Protection Manager End User Recovery feature to the Volume Shadow Copy Service client. Therefore, the Volume Shadow Copy Service client can recover files from a Data Protection Manager server.
This update optimizes the way that the Volume Shadow Copy Service client accesses shadow copies in Windows Server 2003 and in Windows XP.