Do you have multiple subdomains on your website? For example, you might have payments.fancyflowervases.com and www.fancyflowervases.com.
If you want Olark conversations to continue across all of your subdomains, go to the Advanced configuration and tell us your main domain:
Now, visitors will be able to continue their chats when they go from one subdomain to another. Cool!
If you are using subdomains on multiple sites, you can enter all of them - just use a comma to separate multiple sites.