Disk editor , A computer program used to edit directories, files, and whole disks.

Byte , The computer space occupied by a single text character.

Character , A letter, number, or punctuation mark etc.

Hack , 1: (c1978-present day) A sequence of steps or a program which does a sequence of steps for changing a computer file or program to accomplish some objective, 2: (c1985-present day) To attempt to gain access to files on a computer stored elsewhere via a network connection, 3: (c1940-1976) Someone who thinks they know how to do something but don't / unintelligent fool, 4:  to wreck / to chop.

Hacking , 1: (c1973-present day)The action of changing a file or program to accomplish some objective.  2:  (c1973-1985) "Hacking together some code" System administrators would "hack together" a piece of code to fix/patch a problem on the computer system. 3: (c1985-present day) Attempting to gain access to files stored on a computer located elsewhere via the manipulation of a computer network. 4: wrecking/trashing/chopping up something,

Hex , 1: Abbreviation of hexadecimal, in computing terms refers to binary/machine code etc. formatted as hexademial numbers to minimise space used up on screen. 2: A curse or spell cast on someone.

Hex editor , A program which converts text/extended/ctrl codes in a computer file into hexadecimal format, and allows you to edit the byte/code of each character. Disk editors usually have a Hex editor built-in to it.

Integer , A number with the decimal places removed.

Offset, A counter which counts in hexadecimal the amount of characters from the start of the file.

Save game file , A file placed on the disk by a game when you wish to stop playing the game, but continue where you left off at a later time.

Scenario file , A preset set of objectives, conditions and settings which the person needs to beat in order to win. Usually used when refering to computer games.