The Host Account Cache maintains an encrypted database that maps host user accounts to Windows NT domain user accounts. The Host Account Cache is a Windows NT service that is installed on Windows NT primary domain controllers. For smaller networks, SNA Server itself may be the domain controller and, therefore, can be used to store the Host Account Cache.
Optionally, a backup Host Account Cache can be installed on any Windows NT backup domain controller. The backup cache maintains a local copy of the user database that can be maintained for recovery purposes, or to eliminate network traffic for single sign-on lookups when installed on the same computer as SNA Server.