4 B

back link: An attribute whose value refers to a directory object, and whose Attribute-Schema object has an odd value for attribute linkId. A back link exists only in response to the existence of a forward link. Forward links can exist with no back links.

back link attribute: A computed attribute whose values include object references (for example, an attribute of syntax Object(DS-DN)). The values are derived from the values of a related attribute, a forward link attribute, or other objects. If f is the forward link attribute, one back link value exists on object o for each object r that contains a value of o for attribute f. The relationship between the forward and back link attributes is expressed using the linkId attribute on the attributeSchema objects representing the two attributes. The forward link's linkId is an even number, and the back link's linkId is the forward link's linkId plus one. For more information, see [MS-ADTS] section

back link value: The value of a back link attribute.

backup browser server: A browser server on a subnet that has been chosen by the local master browser server on that subnet to be available to share the processing load required to serve browser clients. A backup browser server periodically obtains a copy of information concerning available resources on a particular subnet from the master browser server for that subnet.

backup domain controller (BDC): A domain controller (DC) that receives a copy of the domain directory database from the primary domain controller (PDC). There is only one PDC or PDC emulator in a domain, and the rest are backup domain controllers.

backup stream: The components of a Windows NT backup file. It is important not to confuse a backup stream with a named stream. Backup streams are bytes within the main stream of a Windows NT backup file, while a named stream is part of a file that is not a Windows NT backup file that requires a separate open call to access.

Backus-Naur Form (BNF): A syntax used to describe context-free grammars, which is a prescribed way to describe languages.

balloon tooltip: A tooltip displayed inside a balloon-shaped window. It usually has an icon, a title, and the tooltip text.

base64: A binary-to-text encoding scheme whereby an arbitrary sequence of bytes is converted to a sequence of printable ASCII characters.

basic disk: A disk on which each volume can be composed of exclusively one partition.

Basic Encoding Rules (BER): A set of encoding rules for ASN.1 notation. These encoding schemes allow the identification, extraction, and decoding of data structures.

basic provider: A virtual disk service (VDS) provider that manages basic disks.

basic volume: A partition on a basic disk.

BDC: See backup domain controller (BDC).

Bezier curve: A type of curve, defined by a mathematical formula and a number of points greater than or equal to 2, which is used in computer graphics and in the mathematical field of numeric analysis. A cubic Bezier curve is defined by four points: two endpoints and two control points. The curve does not pass through the control points, but the control points act like magnets, pulling the curve in certain directions and influencing the way the curve bends. With multiple Bezier curves, the endpoint of one is the starting point of the next.

bidirectional domain trust relationship: Domains X and Y are said to have a bidirectional trust relationship if there is a domain trust relationship from X to Y and also one from Y to X.

big-endian: Multi-byte values that are byte-ordered with the most significant byte stored in the memory location with the lowest address.

binary large object (BLOB): A collection of binary data stored as a single entity in a database.

binding: The string representation of the protocol sequence, NetworkAddress, and optionally the endpoint. Also referred to as "string binding." For more information, see [C706] section "String Bindings."

BitLocker: BitLocker Drive Encryption. A Microsoft-developed feature appearing in Windows Vista that provides encryption for an entire volume.

blocking mode: Determines if input/output (I/O) operations will wait for their entire data to be transferred before returning to the caller. For a write operation, if blocking is enabled, the write request will not complete until the named pipe reader has consumed all of the data inserted into the named pipe as part of a write request. If blocking is not enabled, the write will complete as soon as the data has been inserted into the named pipe, regardless of when the data in the named pipe is consumed. For a read operation, if blocking is enabled, the read request will be suspended until the data is available to be read. If blocking is not enabled, the read will complete immediately, even if there is no data available to be read.

BNF: See Backus-Naur Form (BNF).

boot configuration file: A file that contains a list of paths to boot partitions. On architectures featuring the Extensible Firmware Interface (EFI), the boot configuration file may be stored on other non-volatile media, such as NVRAM. On all other architectures, it resides in the system partition.

boot file: A file that contains a list of paths to boot partitions. On some systems, the boot file may be stored on other non-volatile media, such as NVRAM.

boot loader: An architecture-specific file that loads the operating system on the boot partition as specified by the boot configuration file.

boot loader file: See boot loader.

boot partition: A partition containing the operating system.

boot volume: See boot partition.

boot.ini: The name of the boot loader file on Windows–based computers.

boxcar: A set of messages transmitted together by way of an underlying MSDTC Connection Manager: OleTx Transports Protocol session.

bridgehead domain controller: A domain controller (DC) that may replicate updates to or from domain controllers (DCs) in sites other than its own.

broadcast: A style of resource location where a client makes a request to all parties on the network simultaneously (a one-to-many communication). Also, a mode of resource location that does not use a name service.

browser: See browser server.

browser client: There are two types of browser clients: workstations and non-browser servers. In the context of browsing, non-browser servers supply information about themselves to browser servers, and workstations query browser servers for information.

browser server: An entity that maintains information about other servers and domains.

bucket rate: A value in a TSpec used to specify an aspect of network traffic behavior, as specified in [RFC2212].

built-in administrator: A built-in account for administering the computer/domain.

built-in domain: A domain object with the issuing authority security identifier (SID) of S-1-5-32.

built-in domain security identifier: The security identifier (SID) of the built-in domain object.

built-in principal: A default security principal whose security identifier (SID) is identical in every domain.

bus: Computer hardware to which peripheral devices may be connected. Messages are sent between the CPU and the peripheral devices using the bus. Examples of bus types include SCSI, USB, and 1394.

bus type: A type of bus. Examples of bus types include SCSI, USB, and 1394.