= C =
cookie jar n.
An area of memory set aside for storing
cookies. Most commonly heard in the Atari ST community; many
useful ST programs record their presence by storing a distinctive
magic number in the jar. Programs can inquire after the
presence or otherwise of other programs by searching the contents
of the jar.
--The Jargon File version 4.3.1, ed. ESR, autonoded by rescdsk.