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

Microsoft Resource Kits - Windows 2000 Resource Kit

Apimon.exe  (Windows 2000 Resource Kit)

The Windows 2000 Resource Kits help IT professionals deploy, manage, and support Windows 2000 operating systems.
There are a number of Windows 2000 Resource Kit software tools available for free download from Microsoft. These tools are listed below, and can help you streamline administrative tasks such as managing Active Directory™, administering security features, working with Group Policy and Terminal Services, automating application deployment, and other important jobs.

Apimon.exe - API Monitor
This tool monitors a running application for all Application Programming Interface (API) calls a process is making. APIMon counts and times the API calls. It also, optionally, monitors page faults caused by the monitored application and reports them by API call.