U
- unapproved signer file
- A file created by the MacSigner application when it creates an approval request. The unapproved signer file contains a DES-encrypted number that is intended to be the user's private key.
- uncompressed sound data
See: decompressed sound data, noncompressed sound data
- undercolor removal
- In CMYK color calculation, the removal of some or all of the cyan, magenta, and yellow inks where black ink is to be substituted
See also: black generation
- underflow exception
- An exception that occurs when the result of an operation is both tiny and inexact.
- underflow notice
- A QuickDraw GX notice indicating that a notice could not be removed from the ignore notice stack because no notice was on the stack.
- underflow warning
- A QuickDraw GX warning indicating that a warning could not be removed from the ignore warning stack because no warning was on the stack.
- unexpected result warning
- A QuickDraw GX warning indicating that a character or font substitution took place or that the geometry of an area or new device is probably incorrect.
- unflatten
- To convert the public, stream-based description of an object or set of objects into the private, native QuickDraw GX object-based format. Used when retrieving a print job
See also: flatten, stream format
- Unicode
- An international standard that combines the characters for all commonly used languages and symbols into a single coded character set, based upon a 16-bit character encoding standard.
- unidirectional text
- A sequence of text that has a single direction
See also: mixed-directional text
- Uniform Resource Locator (URL)
- A text string that describes the location of an HTML document. A URL may point to a file or to a server that contains the file.
- unique items attribute
- A shape attribute that affects the way items are added to picture shapes.
- unit number
- The position of a device driver's entry in the unit table. It is the one's complement of the driver reference number.
- unit table
- A Device Manager data structure containing an array of handles to the device control entries of all installed device drivers.
- universal color spaces
- Color spaces whose colors are device-independent. Universal colors can be compared without the use of color profiles.
- universal interface files
- A set of interface files that you can use with both 680x0 compilers and PowerPC compilers.
- universal procedure pointer
- A generalized procedure pointer that can be either a 68K procedure pointer or the address of a routine descriptor.
- universal script
- A 1-byte complex script system that is compatible with WorldScript I.
- unlimited gap absorption
- The assignment of all justification gap to an individual glyph or priority of glyphs, regardless of the specified grow or shrink limits for that glyph or glyphs.
- unload
- (1) To unlock a segment. By unlocking unneeded segments, you allow them to be relocated or purged if necessary to accommodate a later memory-allocation request. (2) To move a QuickDraw GX object from memory to temporary external storage. QuickDraw GX automatically and transparently loads and unloads objects in the course of managing memory; an application need never know whether an object it accesses is currently loaded or unloaded.
- unlock
- (1) To allow a relocatable block to be moved during heap compaction. (2) To allow a previously locked range of pages to be paged out. (3) To free a previously locked object in the QuickDraw GX heap so that it can be moved
See also: lock
- unmounted volume
- A volume that hasn't yet been mounted, or a volume that was previously mounted but has since had its volume control block removed from the VCB queue.
- unpacking
- The process of reconstructing a data structure from a sequence of bytes
See also: packing
- unpurgeable block
- A relocatable block that can't be purged from the heap.
- untoken table
- A table in the tokens resource that converts script-independent tokens to text of a given script system.
- update event
- An event indicating that the contents of a window need updating.
- update library
- A shared library that contains additions or changes to an existing import library.
- update region
- A region maintained by the Window Manager that includes the parts of a window's content region that need updating. The Event Manager generates update events as necessary, based on the contents of the update region, telling your application to update a window.
- URL
See: Uniform Resource Locator (URL)
- user attributes
- The lower 16 bits of an item's attributes; these bits can be defined for purposes suitable to your application.
- user authentication method
- A process used by a file server or workstation to confirm the user's identity.
- user data
- Auxiliary data that your application can store in a QuickTime movie, track, or media structure. The user data is stored in a user data list; items in the list are referred to as user data items. Examples of user data include a copyright, date of creation, name of a movie's director, and special hardware and software requirements.
- user data item
- A single element in a user data list.
- user data list
- The collection of user data for a QuickTime movie, track, or media. Each element in the user data list is referred to as a user data item.
- user dictionary
- Also called an editable dictionary. A file, complementary to the main dictionary used by input methods, in which users can add information that does not exist in the main dictionary.
- user item
- An item in a dialog box that is managed largely by an application, not by the Dialog Manager. A user item is designated by the constant userItem.
- user name
- A string of characters that uniquely identifies a user for login purposes.
- user node ID
- A node ID that falls within the numeric range of 1_127 ($01_$7F). Unless a program explicitly requests assignment of a node ID within the server range, AppleTalk dynamically assigns a user node ID to a system when an application or process on that system opens AppleTalk.
- User record
- A catalog record representing an entity that has an account on an AOCE messaging or catalog server. A User record contains electronic addresses and biographical information about the entity that can be read by users of the system, as well as information about the entity's access privileges and password for use by the AOCE software.
- user state
- The size and location that the user has established for a window.
- usual arithmetic conversions
- Automatic conversions performed in the C programming language. The ANSI C specification defines these conversions.
- utility component
- A sound component that performs some modification on sound data and does not communicate directly with any sound output device
See also: sound component, sound output device component
- utility window
- A type of box that has some but not all features of a regular window. A utility window has a bar at the top or side by which it can be dragged and a close box, but it does not necessarily have a title and is nonscrolling. Utility windows typically float above all other windows in your application
See also: floating window