For Windows clients, 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, the runtime uses the user name that the user logged in with.