Can I offer live chat on multiple websites? Can I use the same Zendesk account to add my widget in different places?
Yes. You can allow your customers to chat with you on multiple websites. To do this, paste the same widget code on each site. This allows you to manage chat support for each website from one place. Open up your Chat product to reply to all chat requests in the same Chat dashboard. For more information on how you can embed the widget, see the article: Adding the Chat widget to your website.
How to tell which webpage the chat is coming from
From the dashboard's visitor list, see from which website customers are contacting you through the URL they're currently viewing.
You can also use the tagging feature to indicate which website the customer is browsing and be able to assist them accordingly. You can do this by utilizing the API or a trigger that references the URL of the site and adds a tag accordingly. See this recipe for more information: Recipe: Tag chats based on the URL they were requested from.
How to make the widget look different on each website
Additionally, you can customize how the widget looks on different sites by utilizing custom code. Here's a sample set of code for widget customization. See this user tips and tricks post for more information: How to customize the look and feel of the Chat widget using zopim APIs.