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1993-08-30
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DOCUMENT:Q102611 16-AUG-1993 [W_NT]
TITLE :INF: Windows NT VDMs Keep Their Own System Time
PRODUCT :Windows NT
PROD/VER:3.10
OPER/SYS:WINDOWS
KEYWORDS:
----------------------------------------------------------------------
The information in this article applies to:
- Microsoft Windows NT operating system, version 3.1
- Microsoft Windows NT Advanced Server, version 3.1
----------------------------------------------------------------------
SUMMARY
=======
Windows NT virtual DOS machines (VDMs) keep their own system time.
Each time an MS-DOS-based application or a 16-bit Windows-based
application is started, its BiosDataArea tick count is initialized to
the current system time. When an MS-DOS-based application sets the
time in a VDM, it is reflected in that VDM only. When a 16-bit
Windows-based application changes the time, the new time is reflected
in all 16-bit Windows-based applications running in Windows on Windows
(WOW).
MORE INFORMATION
================
Windows NT is designed this way because MS-DOS-based applications
depend on timer tic hardware for their sense of time. Many
MS-DOS-based applications do not interact favorably with the timer tic
hardware.
Additional reference words: 3.10
KBCategory:
KBSubCategory: winnt
=============================================================================
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 1993.