ActiveXperts Network Monitor 2015 proactively manages network servers, devices, databases and more.

Microsoft Resource Kits - Windows 2003 Resource Kit

Rasusers.exe  (Windows 2003 Resource Kit)

The Window Server 2003 Resource Kit is a set of tools that system administrators and engineers use to manage or support a Windows Server 2003 system. Use it to streamline management tasks such as troubleshooting operating system issues, managing Active Directory, configuring networking and security features, and automating application deployment.
Rasusers.exe - Remote Access Users
RasUsers lets you list for a domain or a server all user accounts that have been granted permission to dial in to the network via Routing and Remote Access, a feature of Microsoft® Windows® 2000 that implements remote access functionality.