How to Use the OH Tool on the Windows NT 4.0 Resource Kit

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This command-line tool shows the handles of all open windows. Alternatively, you can constrain the OH display to show only information relating to a particular process, object type, or object name. This feature is useful when a sharing violation occurs because you can find the process that has a file open at the time of violation.

To function properly, OH requires that an option internal to the Windows NT kernel be enabled. This option maintains a linked list of all objects by object type. If OH detects that this option is not set, OH sets it and sends a message that the user must restart the computer before the option will take effect. After restarting, OH can give useful results.

This linked list costs 8 bytes of overhead for each object. If desired, this option can later be disabled with Gflags.exe (in the Windows NT 4.0 Resource Kit) by clearing the check box for" Maintain a list of objects for each type" in the Global Flags window, then restarting the system.

The most convenient way to use OH is to have it pipe the data to a text file. At the command prompt type: To view the data, open the file with Notepad.