I've been able to link directly to, and launch, a publicly accessible
workflow via a URL, but am not finding it as easy to construct the URL to a
workflow that requires authentication.

My client does not want to have to teach end users how to navigate through 4
levels of the UserApp to get to a workflow request.

Ideally, I imagine that I can construct a URL that, when clicked, will take
the user to the Login.jsf page for authentication, and then will take the
user directly to the workflow Request Form.

Is this possible? Documented? If not documented officially, anyone have a
cool solution?