I guess if you’re a domain name registrar, you use entire domains for even trivial things like, say, your e-mail help manual. ‘emailuserguide.com’ is a domain for hosting the Network Solutions email user guide. Apparently, the whole thing is meant to be in a pop-up help window.
But wait, it gets better. The bulk of the guide is actually in a PDF file. So the domain, as best I can tell, hosts about 19 pages altogether (mostly FAQ material), with links to other places or files that have actual useful information.
Oh, and if you’re managing your account, you’ll want to use accountmanageruserguide.com.