Word:

magic cookie

1.magic cookie - Something passed between routines or programs that enables the receiver to perform some operation; a capability ticket or opaque identifier. Especially used of small data objects that contain data encoded in a strange or intrinsically machine-dependent way. E.g. on non-Unix operating systems with a non-byte-stream model of files, the result of "ftell" may be a magic cookie rather than a byte offset; it can be passed to "fseek", but not operated on in any meaningful way. The phrase "it hands you a magic cookie" means it returns a result whose contents are not defined but which can be passed back to the same or some other program later.
2.magic cookie - An in-band code for changing graphic rendition (e.g. inverse video or underlining) or performing other control functions. Some older terminals would leave a blank on the screen corresponding to mode-change magic cookies; this was also called a glitch (or occasionally a "turd"; compare mouse droppings).

See also cookie.
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Maggot
Maggot-pie
maggotbox
Maggotiness
Maggotish
Maggoty
Magh
Magha
Maghet
Maghreb
Magi
Magian
Magic
magic bullet
Magic Carpet
Magic circle
-- magic cookie --
magic eye
Magic humming bird
magic lantern
Magic Marker
magic mushroom
Magic music
magic number
Magic Paper
magic realism
magic smoke
magic spell
magic square
Magic Switch Story
magic trick
Magic wand
magical
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