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".
Under UNIX clients, the runtime uses the user name that the user logged in with.