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native services

See system services.

national language support (NLS)

A set of routines that give applications access to locale-specific information.

See also Unicode.

National Television System Committee (NTSC)

The standards-setting body for television and video in the United States. Part of the Electronics Industries Association (EIA).

NDIS

See network driver interface specification (NDIS).

network driver interface specification (NDIS)

The interface for network drivers used in Windows. NDIS provides transport independence for network vendors because all transport drivers call the NDIS interface to access the network.

Network Programming Interface (NPI)

Defines the interface between network modules that can be attached to one another.

nibble mode

An asynchronous, peripheral-to-host channel defined in the IEEE 1284-1944 standard. Provides a channel for the peripheral to send data to the host, which is commonly used as a means of identifying the peripheral.

NLS

See national language support (NLS).

NMI

See nonmaskable interrupt (NMI).

non-inplace

Describes an operation that does not occur directly on input data, but instead requires an additional buffer for temporary storage. Opposite of inplace.

noninterlaced

The method of scanning all lines on a display from top to bottom in sequential order at a specific rate per second. Unlike television, which uses an interlaced scanning method, computers typically use noninterlaced monitors.

nonmaskable interrupt (NMI)

An interrupt that cannot be overruled by another service request. A hardware interrupt is called nonmaskable if it bypasses and takes priority over interrupt requests generated by software, the keyboard, and other devices.

nonpaged pool

See pool memory.

nonpresent device

A device that was previously installed on a system, but is currently not configured in the system. A nonpresent device does not have a devnode in the Device Tree and is hidden by default by Device Manager (see the topic, Viewing Hidden Devices).

Also called phantom device.

non-uniform memory access (NUMA)

A multiprocessor architecture that divides a system into nodes. Each node might include one or more processors, some memory, and a bus. A node's memory is "local" to its processors, and the processors can access the memory relatively fast. Processors in one node can also access memory in different ("distant") nodes, but access time is slower. "Non-uniform memory access" refers to this difference between the speed at which processors can access local memory and the speed at which they can access distant memory. Most NUMA architectures are also ccNUMA (cache-coherent NUMA) architectures, because they provide cache coherency across the nodes.

notional space

A coordinate system font designers use when they design fonts. For example, PostScript fonts are designed in 1000x1000 unit character cells. Before a glyph in a particular font can be rendered on an output device, its notional space coordinates must be first be transformed into device space coordinates. These coordinates must then be transformed into coordinates suitable for the physical device.

Most of the metrics returned in the IFIMETRICS structure are given in terms of notional space coordinates.

Also called design space.

NPI

See Network Programming Interface (NPI).

NtDetect

See advanced RISC computing.

NTF files

Binary files used for describing the device fonts of Postscript-compatible printers. Adobe Font Metrics (AFM) files must be converted to NTF files.

NTFS

A file system, native to Windows NT-based operating systems, that supports file system and file data recovery, extremely large storage media, file-granular compression, and various other features.

NTSC

See National Television System Committee (NTSC).

NTSC format

A color-television format having 525 scan lines, a field frequency of 60 Hz, a broadcast bandwidth of 4 MHz, a line frequency of 15.75 KHz, a frame frequency of 1/30 of a second, and a color subcarrier frequency of 3.58 MHz.

See also SECAM.

NTVDM

The Windows NT-based operating system virtual DOS machine. Also called VDM.

NtXxx Routines

A set of routines used by user-mode components of the operating system to interact with kernel mode. Drivers must not call these routines; instead, drivers can perform the same operations by calling the ZwXxx Routines.

null driver

A nonexistent driver. Setup sometimes installs a null driver for a device. For more information, see the topic, Installing a Null Driver.

NUMA

See non-uniform memory access (NUMA).

N-up

The printing of multiple document pages on a physical page.

 

 

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