tag file

A file used by Setup to determine if a user has inserted the correct removable medium during a device installation. This file can contain anything, or nothing. It can be one of the files to be installed, a cabinet file containing files to be installed, or a separate noninstallation file. A tag file should be unique to each version of each removable medium used for an installation. Tag files are specified in INF SourceDisksNames Section.

tagged file format

A file format in which data is tagged by using standard headers that identify information type and length.

tape miniclass driver

A SCSI-device-specific driver linked with the system-supplied SCSI tape class driver. If a tape miniclass driver calls only routines in the tape class driver, the miniclass driver can be portable across Microsoft operating systems that support Win32 applications.


See telephony application program interface (TAPI).


Translation buffer.

See TLB.


Thread environment block.

Telecommunications Industry Association (TIA)

A national trade organization that represents companies in the telecommunications industry. The TIA contributes to the development of communications and networking standards.


Telephone technology. The conversion of sound into electrical signals, its transmission to another location, and its reconversion to sound, with or without the use of connecting wires.

telephony application program interface (TAPI)

A set of Win32-based calls that applications use to control modems and telephones by routing application function calls to the appropriate service provider DLL for a modem.


See Telecommunications Industry Association (TIA).


Target identifier. One of up to eight target controllers on a SCSI-II bus through which peripheral devices are addressable, either as numbered TIDs or as logical units (LUs) subordinate to a particular TID.


See time independent escape sequence (TIES).


Repetition of a brush pattern, to cover an entire device surface.

time independent escape sequence (TIES)

Time independent escape sequence (TIES) provides a means to switch between command mode and data mode on an analog modem. TIES is an alternate method to the Heatherington escape sequence. TIES was developed by a group of modem manufacturers in 1991.


For MPEG, frame-by-frame address code time reference recorded on the spare track of a videotape or inserted in the vertical blanking interval. It is an eight-digit number, encoding time in hours, minutes, seconds, and video frames (for example, 02:04:48:26).

timer object

A timer object is an instance of a kernel-defined dispatcher object type. User-mode timer objects can be used to synchronize the execution of specific actions, optionally an APC, with time. Kernel-mode timer objects are used to synchronize the execution of specific actions, in particular a DPC, with time.

For more information see the topic, Timer Objects and DPCs.


Translation lookaside buffer.

(Not directly accessible by system software for the i386; otherwise, an on-chip virtual-to-physical-page address translation cache for high-end x86 and MIPS microprocessors.)

toaster device

A hypothetical peripheral device of an unknown class.

token object

A security object type, representing an authenticated user process. Every process has an assigned token, which becomes the default token for each of that process's threads. However, an individual thread can be assigned a token that overrides this default.

transactional NTFS (TxF)

Routines that allows file operations on an NTFS file system volume to be performed in a transaction. For more information about TxF, see the Transactional NTFS (TxF) topic.

transactional registry (TxR)

Routines that allow transacted registry operations.

trap handler

A body of code in the kernel to which the processor transfers control when an interrupt or exception occurs. The trap handler determines the type of condition that caused the interrupt or exception and transfers control to an ISR or exception handler.

triangle texture fill

A texture fill in which the surface of a three-dimensional image is partitioned into a mesh of triangles, each of which is filled with the same texture.


A file system operation that erases logical block addresses that are assigned to deleted files in order to create free memory space and improve write performance.

True Type font substitute (TTFS)

For printers that provide hardware-resident or cartridge fonts, a font substitution table can be specified. By providing a font substitution table, you specify hardware-resident or cartridge fonts that can be substituted for TrueType fonts that must be downloaded. When Unidrv receives text in such a TrueType font, it first checks to see if the font substitution table contains a hardware-resident substitution for the font. If Unidrv finds a substituted resident font, and if the font metrics (such as character set, weight, italic, orientation, and so on) are compatible, the resident font is used.


A data structure defined by the PCMCIA to describe a single, specific characteristic of a PC card device. Tuples are chained together to form the CIS, which describes to system software the PC Card's resource requirements and other characteristics. Tuples consist of a tuple code, an offset to the next tuple, and a number of bytes specific to the tuple.


API for image acquisition developed by an association of industry leaders. The specification is available from http://www.twain.org.



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