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Microsoft Resource Kits - Windows 2000 Resource Kit

Oh.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.

Oh.exe - Open Handles
This command-line tool shows the handles of all open windows. You can also constrain OH to only show information relating to a specific process, object type, or object name. This feature is useful for finding which process has a file open when a sharing violation occurs. To function properly, OH must enable a kernel option which maintains a linked list of all objects by object type. If not set, OH enables this option and notifies you that you must reboot before OH will function. After rebooting, OH can display information.