The user account “SSAdministrator” is used on the GlobalSearch server to access internal web components, temporary files, SQL Server data, and files located in Archives and Inboxesthe service account used to proxy all document and data access requests to individual clients. This account is used when authorizing access for most Square 9 Windows Services, in addition to acting as the Application Pool user for both GlobalSearch and GlobalCapture. GlobalSearch installs the SSAdministrator with a confidential, complex password, which it is recommended that you can change. A complex password is not required by GlobalSearch, but it must comply with your system’s password guidelines for the application to work properly. The password is case sensitive.

During an installation, the user performing the installation will be prompted to enter the GlobalSearch Admin password, which is the SSAdministrator password. 

Change Password in Application Pools

...