{TECO}, or under TOPS-10 —- always alt, as in "Type alt alt to end a TECO command" or "alt-U onto the system" (for "log onto the [ITS] system"). This was probably because alt is more convenient to say than `escape', especially when followed by another alt or a character (or another alt *and* a character, for that matter).
:alt bit: /awlt bit/ [from alternate] adj. See {meta bit}.
:altmode: n. Syn. {alt} sense 3.
:Aluminum Book: [MIT] n. `Common LISP: The Language', by Guy L. Steele Jr. (Digital Press, first edition 1984, second edition 1990). Note that due to a technical screwup some printings of the second edition are actually of a color the author describes succinctly as "yucky green". See also {{book titles}}.
:amoeba: n. Humorous term for the Commodore Amiga personal computer.
:amp off: [Purdue] vt. To run in {background}. From the UNIX shell `&'
operator.
:amper: n. Common abbreviation for the name of the ampersand (`&',
ASCII 0100110) character. See {{ASCII}} for other synonyms.
:angle brackets: n. Either of the characters `<' (ASCII
0111100) and `>' (ASCII 0111110) (ASCII less-than or
greater-than signs). The {Real World} angle brackets used by
typographers are actually taller than a less-than or greater-than
sign.
See {broket}, {{ASCII}}.
:angry fruit salad: n. A bad visual-interface design that uses too
many colors. This derives, of course, from the bizarre day-glo
colors found in canned fruit salad. Too often one sees similar
effects from interface designers using color window systems such as
{X}; there is a tendency to create displays that are flashy and
attention-getting but uncomfortable for long-term use.
:annoybot: /*-noy-bot/ [IRC] n. See {robot}.
:AOS: 1. /aws/ (East Coast), /ay-os/ (West Coast) [based on a PDP-10 increment instruction] vt.,obs. To increase the amount of something. "AOS the campfire." Usage: considered silly, and now obsolete. Now largely supplanted by {bump}. See {SOS}. 2. A {{Multics}}-derived OS supported at one time by Data General. This was pronounced /A-O-S/ or /A-os/. A spoof of the standard AOS system administrator's manual (`How to Load and Generate your AOS System') was created, issued a part number, and circulated as photocopy folklore. It was called `How to Goad and Levitate your CHAOS System'. 3. Algebraic Operating System, in reference to those calculators which use infix instead of postfix (reverse Polish) notation.
Historical note: AOS in sense 1 was the name of a {PDP-10} instruction that took any memory location in the computer and added 1 to it; AOS meant `Add One and do not Skip'. Why, you may ask, does the `S' stand for `do not Skip' rather than for `Skip'? Ah, here was a beloved piece of PDP-10 folklore. There were eight such instructions: AOSE added 1 and then skipped the next instruction if the result was Equal to zero; AOSG added 1 and then skipped if the result was Greater than 0; AOSN added 1 and then skipped if the result was Not 0; AOSA added 1 and then skipped Always; and so on. Just plain AOS didn't say when to skip, so it never skipped.
For similar reasons, AOJ meant `Add One and do not Jump'. Even more bizarre, SKIP meant `do not SKIP'! If you wanted to skip the next instruction, you had to say `SKIPA'. Likewise, JUMP meant `do not JUMP'; the unconditional form was JUMPA. However, hackers never did this. By some quirk of the 10's design, the {JRST} (Jump and ReSTore flag with no flag specified) was actually faster and so was invariably used. Such were the perverse mysteries of assembler programming.
:app: /ap/ n. Short for `application program', as opposed to a systems program. What systems vendors are forever chasing developers to create for their environments so they can sell more boxes. Hackers tend not to think of the things they themselves run as apps; thus, in hacker parlance the term excludes compilers, program editors, games, and messaging systems, though a user would consider all those to be apps. Oppose {tool}, {operating system}.
:arc: [primarily MSDOS] vt. To create a compressed {archive} from a group of files using SEA ARC, PKWare PKARC, or a compatible program. Rapidly becoming obsolete as the ARC compression method is falling into disuse, having been replaced by newer compression techniques. See {tar and feather}, {zip}.
:arc wars: [primarily MSDOS] n. {holy wars} over which archiving program one should use. The first arc war was sparked when System Enhancement Associates (SEA) sued PKWare for copyright and trademark infringement on its ARC program. PKWare's PKARC outperformed ARC on both compression and speed while largely retaining compatibility (it introduced a new compression type that could be disabled for backward-compatibility). PKWare settled out of court to avoid enormous legal costs (both SEA and PKWare are small companies); as part of the settlement, the name of PKARC was changed to PKPAK. The public backlash against SEA for bringing suit helped to hasten the demise of ARC as a standard when PKWare and others introduced new, incompatible archivers with better compression algorithms.
:archive: n. 1. A collection of several files bundled into one file by a program such as `ar(1)', `tar(1)', `cpio(1)', or {arc} for shipment or archiving (sense 2). See also {tar and feather}. 2. A collection of files or archives (sense 1) made available from an `archive site' via {FTP} or an email server.
:arena: [UNIX] n. The area of memory attached to a process by `brk(2)' and `sbrk(2)' and used by `malloc(3)' as dynamic storage. So named from a semi-mythical `malloc: corrupt arena' message supposedly emitted when some early versions became terminally confused. See {overrun screw}, {aliasing bug}, {memory leak}, {memory smash}, {smash the stack}.
:arg: /arg/ n. Abbreviation for `argument' (to a function), used so often as to have become a new word (like `piano' from `pianoforte'). "The sine function takes 1 arg, but the arc-tangent function can take either 1 or 2 args." Compare {param}, {parm}, {var}.
:armor-plated: n. Syn. for {bulletproof}.
:asbestos: adj. Used as a modifier to anything intended to protect one from {flame}s. Important cases of this include {asbestos longjohns} and {asbestos cork award}, but it is used more generally.
:asbestos cork award: n. Once, long ago at MIT, there was a {flamer} so consistently obnoxious that another hacker designed, had made, and distributed posters announcing that said flamer had been nominated for the `asbestos cork award'. Persons in any doubt as to the intended application of the cork should consult the etymology under {flame}. Since then, it is agreed that only a select few have risen to the heights of bombast required to earn this dubious dignity —- but there is no agreement on *which* few.
:asbestos longjohns: n. Notional garments often donned by {USENET} posters just before emitting a remark they expect will elicit {flamage}. This is the most common of the {asbestos} coinages. Also `asbestos underwear', `asbestos overcoat', etc.
:ASCII:: [American Standard Code for Information Interchange]
/as'kee/ n. The predominant character set encoding of present-day
computers. Uses 7 bits for each character, whereas most earlier
codes (including an early version of ASCII) used fewer. This
