The number of independently operating accounts you can use to contact visitors on your website.

Example: Your business has 3 employees. Two travel and use Olark through Google talk on their iPhones. Sometimes they aren't available to chat and the 3rd employee at the office is always on to respond if the two mobile users don't quickly respond.

To prevent multiple responses to inbound chats when multiple operators are logged, the first responder gets the chat and other operators are automatically informed.