I saw this DistributedScanManagement.ldf file this morning on the Microsoft Downloads website so - it's for use with Windows 7 and scanned documents (I won't be using this feature just yet).
http://www.microsoft.com/downloads/details.aspx?displaylang=en&FamilyID=d89ac7c0-2dad-49cc-9ccd-5f7884e4dbdf
MSDN Extract:
Web Services for Devices Distributed Scan Management
Web Services for Devices (WSD) Distributed Scan Management enables IT administrators to manage scanning services for organizations with many users. WSD Distributed Scan Management is implemented in Windows Server 2008 R2.
A device that supports WSD Distributed Scan Management can be a network-connected image scanner, or it can be a scanner function in a network-connected copier or multifunction printer. A WSD scan device works in conjunction with a WSD distributed scan server. A scan server is a computer that runs the Windows Distributed Scan Server, which is a feature of Windows Server 2008 R2. During a scanning job, the scan device acquires images from the documents that it scans, and it sends the images to the scan server. The scan server processes and stores the images.
A user initiates a scanning job from the user interface of a WSD scan device instead of from the user interface of an application running on a desktop computer. To configure the device for the scanning job, the user selects a scan process—a set of instructions for acquiring and processing images—that was previously created by an administrator. The scan process contains the following information:
A scan ticket that contains the image-acquisition settings for the WSD scan device.
A set of scan processing instructions to specify how the images acquired by the device are to be processed and stored by the WSD distributed scan server.
Typically, the user can override certain parameter values in the scan ticket. For example, the user might select a different color space or change the image resolution.
http://msdn.microsoft.com/en-us/library/dd434706.aspx