Tiruvallur is well known, one of the reason being the Veeraragava Temple. The new moon day is very auspicious day for the lord and so for the people of the town.ccording to 2011 census of India, Thiruvallur district had a population of 3,728,104 with a sex-ratio of 987 females for every 1,000 males, much above the national average of 929.
Kanyakumari district
Kanyakumari district is the southernmost district in Tamil Nadu state and mainland India. It is the second largest district in the state in terms of population density and the second most urbanized, next only to Chennai district. The district stands first in terms of literacy rate in the state. The district headquarters is Nagercoil.
Havel
The Havel is a river in Germany. It flows through Mecklenburg-Western Pomerania, Brandenburg, Berlin and Saxony-Anhalt.
Virtual DOS machine
A Virtual DOS machine (VDM) permits the users of computers to run 16-bit or 32-bit DOS and 16-bit Windows programs on 32-bit computers when there already is a different operating system using the hardware.
Virtual DOS machines normally use the virtual 8086 mode of the Intel 80386 (or later) processor, allowing many 8086 applications to function by translating operating system commands to make applications think that they are running on an 8086. The operating system can then emulate the DOS software.
VDMs like Windows 3.x 386 Enhanced Mode can add support for using 16-/32-bit protected mode software if they use the DOS Protected Mode Interface (DPMI).
If a DOS program in a VDM needs to use a peripheral, Windows will give the DOS program a virtual device driver (VDD) which emulates the hardware using commands that the operating system it is running on can understand.
DOS VDMs appeared on Windows/386 2.01 in 1987 and were also in Windows 3.x, if you were using 386 Enhanced Mode as well as in 95, 98, 98 SE and Me.
Similar to Windows 3.x, VDMs can let you run many DOS applications at one time if you use the EMM386 /MULTI option. Digital Research / Novell was working on a similar system since 1991 under the codename "Vladivar" (originally a device driver KRNL386.SYS and not part of EMM386). It was made for the next version of DR DOS, released as Novell DOS 7 in 1994, but it was also used in their "Star Trek" project, which they stopped working on before finishing.
VDMs called MVDM (Multiple Virtual DOS Machine) are used in OS/2 2.0 and later. OS/2 MVDMs are better than NTVDM in many ways, for example with block devices. While the OS/2 1.x emulated DOS 3.0, 2.x emulated DOS 5.0.
Running Windows 3.1 applications in OS/2 looks similar to XP Mode in Windows 7, but the technologies used are very different. A "guest" VDM permits programs to use the disks of the OS/2 or NT operating system that is running the VDM. Applications in a VDM can use named pipes to talk to their "host".
NTVDM is included in all x86 versions of Windows made on NT, and let 16-bit Windows and 16-/32-bit DOS applications run. It is not included with 64-bit versions (see Limitations). ntvdm.exe helps emulate the APIs needed to run 16-bit DOS and Windows applications.
NTVDM uses NTIO.SYS and NTDOS.SYS, which runs a changed version of COMMAND.COM. The 16-bit system files are smaller versions of their MS-DOS 5.0 counterparts, including IO.SYS, MSDOS.SYS and COMMAND.COM, which remove biases with the FAT file system and can also call the 32-bit NTVDM if needed. NTDOS originally gave a DOS version of 30.00 to programs, but this soon was changed to 5.00 to let more programs to run without being changed However, there are many newer MS-DOS functions and commands added to MS-DOS versions 6.x and in Windows 9x which are not there.
16-bit programs run separately within one 32-bit NTVDM process. Checking "Run in separate memory space" in the "Run" dialog box or shortcut of the program creates a new process instead. NTVDM emulates BIOS functions, the Windows 3.1 kernel, and its 16-bit API.
32-bit DOS emulation is used for DPMI and using 32-bit memory. wowexec.exe is the emulator process for 16-bit Windows. Windows 2000 added Sound Blaster 2.0 emulation to 32-bit NTVDM. 16-bit and DOS virtual device drivers can't be run. Win16 programs can communicate with other parts of Windows using OLE, DDE and named pipes.
As virtual 8086 mode isn't available on non-x86 processors, NTVDM was a full emulator for NT on these architectures. NT 3.51 could only 80286, but since NT 4.0, 486 emulation was added.
In January 2010, Google security researcher Tavis Ormandy discovered a large security problem in NTVDM system letting non-Administrators to increase their permissions to the SYSTEM level. Ormandy claimed it was a problem for all x86 versions of Windows NT after 1993. 32-bit versions of NT 3.X/4.0, 2000, XP, 2003, Vista, 2008, and 7 were affected. Ormandy published how the problem works. Before Microsoft could fix it, you could turn off 16-bit application support to solve the problem, but it made so you could not run 16-bit programs. x64 Windows never had this problem because it doesn't use NTVDM. After applying the security fixes Microsoft made available, NTVDM could be turned on safely.
NTVDM and wowexec had limitations on Windows XP and later because of a GDI object limit per session, which might cause GDI handles to be moved two bits to the right when changing 32 to 16 bits. Handles thus could not be larger than 14 bits, so 16-bit programs with a GDI handle larger than 16384 would crash.
On x86-64 CPUs, virtual 8086 mode is only available as a legacy sub-mode (if running a 32-bit operating system), but not in 64-bit long mode, which is why NTVDM is not included with 64-bit versions of Windows, so 16-bit applications cannot be run on 64-bit Windows. You'll need Windows XP Mode or similar virtualization software to run 16-bit programs within a 64-bit operating system.
NTVDM cannot run DOS games on computers of today. Emulation is only provided for simple peripherals. For example, sound in NTVDM can be limited. Windows NT only updates the screen a few times per second when DOS programs write on it, and they can't emulate high-resolution graphics options. As software runs at the speed of the CPU, all "timing loops" stop too early. This either makes games run too fast, or causes the software to not see some emulated hardware peripherals, because it can not wait that long for an answer.
Imambara Zadibal
Imambara Zadibal is the first Imambara constructed in Kashmir Valley by Kaji Chak, minister in the regime of Sultan Mohammad in the year 1518. This Imambara was burned down and destroyed number of times.
One of the most ancient monuments of Kashmir, Imambara Zadibal is in the state of Jammu and Kashmir, administered by India. It lies in the Zadibal area within Srinagar to the west side of the fort. Built in 1518, this shrine was erected by Kaji Chak, who was a minister with Sultan Mohammed Shah. This two-storey building is one of the oldest historic places in Kashmir valley. Sitting on the lines of Persian architecture, this shrine looks old and it is a popular tourist spot. From 1548 AD to 1872 AD, the building was set on fire eleven times and it was rebuilt each time. Recently, the ancient Imambara was taken down in 2004 to restructure and rebuild the shrine that stands today. The shrine is large enough to hold more than 32,000 visitors at a time.
There are different stories about the construction of the Imambara Zadibal, but the history says Tajik Shah donated the land of the zadibal to Mir Shamshud din Iraqi, who introduced Shia Islam to Kashmir and influenced the government officials of that time.