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Microsoft Resource Kits - Windows 2003 Resource Kit

Atmarp.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.
Atmarp.exe - Windows ATM ARP Server Information Tool
Used to troubleshoot the status of the ATM ARP/MARS Service that ships with Windows 2000/2003 Server.
/s - Displays statistics for the ARP and MARS server
/c - Displays the ARP and MARS caches
/reset > Resets the ARP and MARS statistics