The multi-tenancy feature in Orchard enables you to host multiple sites within the same Orchard instance. It’s not a a security feature, just a way to improve site density, and to enable you to save on hosting costs. Nevertheless, a request to a specific existing tenant should never be answered with a page from another tenant. Ever.
Placement.info is an XML file that orchestrates the different parts of a content item and sends each of the shapes they create into specific local content zones. If the previous sentence sounded confusing to you, fear not, this post is for you.
If you want to create a simple widget in Orchard, such as a box of social links, you have three possibilities: