For DOS and Windows clients logged into a Windows NT network, the runtime uses the NT domain user name that the user logged in with. For DOS and Windows clients that are not logged into a Windows NT network, the runtime uses the user name value that is set by the environment variable USERNAME. If USERNAME is not set, then the runtime uses the value that is set by the environment variable USER. (The values assigned to these variables are case-sensitive. Be sure that the case used in the AcuAccess file matches the case of the value set in the variable.) If neither of these environment variables is set, then the runtime uses the name "USER".
Although individual and group accounts can have any name, the service should always be run as the "SYSTEM" account. Even though it is possible to change the account a service runs under (using the Service Control Applet), you should never change the account name for the AcuServer service.
For UNIX clients, the runtime uses the user name that the user logged in with.