input: [Preset duration] 30 minutes from the configuration or update. [Description] Used to determine new sessions or visits. The cookie is created when the JavaScript library is executed and there are no __utmb cookies. The cookie is updated whenever data are sent to Google Analytics. [Cookie name] 
output: __utmb
options: _ _ u t m a
options: _ _ u t m b
options: _ _ u t m c
options: _ _ u t m z
options: _ _ u t m v
options: _ _ g a