HackerSomeone who breaks into computer systems in order to steal, change or destroy information.
handleAn object that identifies an enterprise bean. A client can serialize the handle and then later deserialize it to obtain a reference to the enterprise bean.
HandlerA "subroutine" or "method" that is called by Perl when your program needs to respond to some internal event, such as a "signal", or an encounter with an…
hard referenceA "scalar" "value" containing the actual address of a "referent", such that the referent's "reference" count accounts for it.
hardwareThe physical components of a computer system-the computer, plotters, printers, terminals, digitizers, and so on.
HashA mathematical algorithm that represents a unique value for a given set of data, similar to a digital fingerprint.
hash codeA value returned by a hash function. A hash code can be used as an index into a random-access data structure, providing an efficient mapping between an…
Hash FunctionA function used to create a hash value from binary input. The hash is substantially smaller than the text itself, and is generated by the hash function in…
hash tableA data structure used internally by Perl for implementing associative arrays (hashes) efficiently. See also "bucket".
header fileA file containing certain required definitions that you must include "ahead" of the rest of your program to do certain obscure operations.
here documentSo called because of a similar construct in shells that pretends that the lines following the "command" are a separate "file" to be fed to the command, up…
heterogeneous collectionA collection of objects with different dynamic types. See homogeneous collection.
hexadecimalA number system with a base of 16. The digits are 0-9 and A-F, where F equals the decimal value of 15.
hierarchyA classification of relationships in which each item except the top one (known as the root) is a specialized form of the item above it.
high level programming languageLanguages such as Java, C++, Ada, etc. which provide programmers with features such as control structures, methods, classes, packages, etc.
HLR (Home Location Register)The Home Location Register (HLR) is a database for permanent storage of subscriber data and service profiles.
home directoryThe directory you are put into when you log in. On a Unix system, the name is often placed into $ENV{HOME} or $ENV{LOGDIR} by login, but you can also find…
home handleAn object that can be used to obtain a reference to the home interface. A home handle can be serialized and written to stable storage and deserialized to…
home interfaceOne of two interfaces for an enterprise bean. The home interface defines zero or more methods for managing an enterprise bean.
homogeneous collectionA collection of objects with the same dynamic type. Arrays are the most common homogeneous collection objects. See heterogeneous collection.
hostIn a network, the central computer which controls the remote computers and holds the central databases.
host systemA computer system on which a process is run.
HTTP (HyperText Transfer Protocol)The underlying protocol used by the World Wide Web. HTTP defines how messages are formatted and transmitted, and what actions Web servers and browsers…
hubrisExcessive pride, the sort of thing Zeus zaps you for. Also the quality that makes you write (and maintain) programs that other people won't want to say…