DOCUMENT:Q172710 09-AUG-2001 [winnt] TITLE :How to Use the OH Tool on the Windows NT 4.0 Resource Kit PRODUCT :Microsoft Windows NT PROD/VER:WinNT:4.0 OPER/SYS: KEYWORDS:kbtool ====================================================================== ------------------------------------------------------------------------------- The information in this article applies to: - Microsoft Windows NT Workstation version 4.0 - Microsoft Windows NT Server version 4.0 ------------------------------------------------------------------------------- SUMMARY ======= This article discusses the OH monitoring tool OH (Oh.exe) that is included in the Microsoft Windows NT Server 4.0 Resource Kit Supplement Two. The OH utility can help monitor which files, registry keys, and directories are in use by certain services at any given time. MORE INFORMATION ================ 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: Oh >***.txt {where *** is the name you provide} To view the data, open the file with Notepad. REFERENCES ========== For additional information about the OH utility, type the following line at a command prompt type, and then press ENTER: Use OH /? ====================================================================== Keywords : kbtool Technology : kbWinNTsearch kbWinNTWsearch kbWinNTW400 kbWinNTW400search kbWinNT400search kbWinNTSsearch kbWinNTS400search kbWinNTS400 Version : WinNT:4.0 Issue type : kbinfo ============================================================================= THE INFORMATION PROVIDED IN THE MICROSOFT KNOWLEDGE BASE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. MICROSOFT DISCLAIMS ALL WARRANTIES, EITHER EXPRESS OR IMPLIED, INCLUDING THE WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL MICROSOFT CORPORATION OR ITS SUPPLIERS BE LIABLE FOR ANY DAMAGES WHATSOEVER INCLUDING DIRECT, INDIRECT, INCIDENTAL, CONSEQUENTIAL, LOSS OF BUSINESS PROFITS OR SPECIAL DAMAGES, EVEN IF MICROSOFT CORPORATION OR ITS SUPPLIERS HAVE BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. SOME STATES DO NOT ALLOW THE EXCLUSION OR LIMITATION OF LIABILITY FOR CONSEQUENTIAL OR INCIDENTAL DAMAGES SO THE FOREGOING LIMITATION MAY NOT APPLY. Copyright Microsoft Corporation 2001.