drupal_retrieve_form('user_edit')

I'm finding out that form are not necessarily what they say they are. For instance, I added first name and last name to user information. On the user edit page, they are on two different sub pages, Account settings & Account information, two different forms. I'm suppose to use "drupal_retrieve_form('user_edit')" to retrieve both of them. What I'm having a hard time with is retrieving both at the same time. I want this information on the same page, not two different pages. I can't figure out how to retrieve one or the the other. My question is, how do I get "edit/Account+information" form when I'm on "/edit"? Thanks!

Sean