Iff - if and only if

Implicit Invocation - (p1,implinv)

Immutable - Shareable among non-cooperating users (p1,immut) & (im1)

Import, a CMS command - (ixport)

Inferior Meters - (p1,depmet)

Inflator - (inf)

Initial Domain Load - (p1,bb)

Initial Program - (p1,bb)

Initial Slots - Part of a Memory Tree (p1,initialslot)

Injunction - (inj)

Input (from terminals) Line Editing Characters - (p2,line-editing)

Inscrutability of Keys - (ik)

Integral Regime - (p3,integral)

Integrity - (integ), (integ-87)

Interrupt - (We don't) (interrupt)

IPL key - (p2,iplkey)

IUCV - (iucv,)

IUCVPATH - (iucv,iucvpath)

IUCVPATHF - (iucv,iucvpathf)

IXPORT - Import and Export for CMS (ixport)