Our company hosts a cloud-based service where organizations can set up a specific webapp page and host it on our server. So for example, say our site is examplewebsite.blah, their specific page will be at cloud.examplewebsite.blah/weirdnumbers/andstuff/theirprofile.html (PM me for links to actual pages). They will then start sending tons of users (several thousand) to that page, either internally or through their public website. There is only a tiny reference and link to our main website on that page. So I guess my question is how to get the maximum amount of SEO to our main website from these hosted pages?