Creating Roles in Windows XP

I'm trying to setup a dev environment for an Intranet application we're working on and needed to test users for displaying role-based content (namely admin edit buttons etc). So I needed to create some test users and roles. The site will ultimately be hosted on a Windows server and the users will use their domain logins from Active Directory so I needed to replicate this.

Anyway my dev environment is Windows XP and there is no obvious way to create roles (or Groups), to access this simply click Start, Run and enter compmgmt.msc and click go to launch the Computer Management Console.

From here you can administrate users and groups under the "Local Users and Groups" folder.