## 13.5.2.2.5.1  Data Storage on WWI Servers and Expert Servers
Windows Wordprocessor Integration (WWI) and Expert read data from the SAP system using Remote Function Call (RFC), process data, and store the results in the database of the SAP system. That is, the WWI generation server (WWI server) and the Expert server save configuration data and cached data locally.
##  Note
Make sure that only as few users as possible can access the Windows servers that run the WWI server and the Expert server.
To apply access permissions in Windows, execute the following steps for the following folders.
For more information on access control and on security auditing, see the Windows Help.
To configure access control for a local file or folder, proceed as follows:
1. Start the Windows Explorer.
2. In the context menu of the file or the folder that you want to audit, choose Properties , and go to the Security tab page.
3. Choose Edit.
4. Add or remove the user names and set the permissions for each user.
##  Note
To improve data storage security, you can apply Windows file system encryption to the folders that hold sensitive data.
## Expert Cache
If you use the specification data cache of Expert, it stores copies of the specification data locally in the Expert server file system. The root folder of the cache is determined in the registry at HKEY\_LOCAL\_MACHINE\SOFTWARE\Wow6432Node\TechniData\EHS-AddOns\CacheRoot .
To protect data, make sure that you set appropriate access permissions on the configured root folder of the cache. Grant read or write access only to LocalSystem , to administrators and to selected users.
## Expert Rules
Apply access permissions to the Expert rules directory. Expert rules are programs that are executed by Expert altering specification data. Make sure that the rules are not altered by unauthorized users.
The rules are usually stored in the Rules folder of the Expert installation, but each rule can be configured separately in the Windows Registry. For more information on the paths to the rules files, see HKEY\_LOCAL\_MACHINE\SOFTWARE\Wow6432Node\TechniData\EHS-AddOns\Instances .
Set appropriate access permissions on the Expert rules folder. Grant access only to LocalSystem, to administrators and to selected users.
## WWI Root Directory
WWI temporarily stores data in the Windows file system to process data in the WWI root directory.
If an error occurs, the temporary files might remain in the root directories. We recommend cleaning up the folder regularly.
The path that indicates the WWI root directory depends on the process. For more information about the path, check the Customizing settings for Product Safety and Stewardship for Process Industries.
- For synchronous generation, check the environment parameter WWI\_GENSERVER\_SYN\_ANCHOR under Basic Data and Tools Basic Settings Specify Environment Parameters
- For background generation, check the WWI root under Basic Data and Tools Report Definition Windows Wordprocessor Integration (WWI) Configuration of Generation PCs Configuration of Generation Servers Manual Configuration of Generation Servers Specify Generation Servers
- For Global Label Management, check the temporary directory for synchronous WWI server under Global Label Management Set Basic Data and Tools for Global Label Management Make Settings for Basic Data
- For print request processing in Global Label Management, check HKEY\_CLASSES\_ROOT\WWIDOCUMENT\AnchorRoot in the Windows registry.
Grant access on the WWI root folders only to LocalSystem, to administrators and to selected users.
## WWI Print Request Cache for Global Label Management
WWI caches templates and generated labels in the Windows file system.
The path that indicates the Windows file system is configured in the WWI.INI file under [DMS]. Set the appropriate access permissions on the WWI root directories. Grant read or write access only to the WWI user, to the LocalSystem , to administrators and to selected users.
The database file or database connection is configured under dbConnection in the WWI.INI file: Set appropriate access permissions on the database file or in the configured database management system. Grant access only to the WWI user, to LocalSystem, to administrators and to selected users.