I have a proposal for a site, where for technical reasons the project manager proposed to run the site on two domains.
It's a Moodle learning site, and we have a Moodle supplier hosting the actual courses, and need pages outside of moodle to do the marketing, branding and surfacing of other content, which Moodle doesn't easily do. So the idea was to host moodle on a subdomain of the parent NGO and have a separate domain for the home page. Needless to say we are doing all of this on a tight budget, otherwise the technical problems wouldn't really be problems.
So the learning site's homepage would be at www.example.org, where you can read about courses, audiences and objctives, as well as log in. On choosing a course you would be forwarded to example.ngo.org. If you clicked home, you would be sent back to example.org
Regardless of the technical reasons for doing this which we might be able to overcome, I'm interested in the UX view. What does this do to users and what reaction can we expect?