Related:

• PPN /P-P-N/, /pip'n/ n. obs. [from `Project-Programmer Number'] A user-ID under TOPS-10 and its various mutant progeny at SAIL, BBN, CompuServe, and elsewhere.
  Old-time hackers from the PDP-10 era sometimes use this to refer to user IDs on other systems as well....
• LPT: /L-P-T/ or /lip'it/ or /lip-it'/ n. Line printer, of course.
  Rare under UNIX, more common among hackers who grew up with ITS, MS-DOS, CP/M and other operating systems that were strongly influenced by early DEC conventions....
• Hacking X for Y: [ITS] n. Ritual phrasing of part of the information which ITS made publicly available about each user.
  This information (the INQUIR record) was a sort of form in which the user could fill out various fields....
• feature shock: [from Alvin Toffler's book title "Future Shock"] n.
  A user's (or programmer's!) confusion when confronted with a package that has too many features and poor introductory material....
• PM: /P-M/ 1. v. (from `preventive maintenance') To bring down a machine for inspection or test purposes.
  See {provocative maintenance}; see also {scratch monkey}....
• GCOS:: /jee'kohs/ n. A {quick-and-dirty} {clone} of System/360 DOS that emerged from GE around 1970
  originally called GECOS (the General Electric Comprehensive Operating System)....
• JR[LN]: /J-R-L/, /J-R-N/ n. The names JRL and JRN were sometimes used as example names when discussing a kind of user ID used under {{TOPS-10}} and {WAITS}
  hey were understood to be the initials of (fictitious) programmers named `J....
• GPV: /G-P-V/ n. Abbrev. for {General Public Virus} in widespread use.
  -- The AI Hackers Dictionary...
• WAITS:: /wayts/ n. The mutant cousin of {{TOPS-10}} used on a handful of systems at {{SAIL}} up to 1990.
  There was never an `official' expansion of WAITS (the name itself having been arrived at by a rather sideways process), but it was frequently glossed as `West-coast Alternative to ITS'....