[IBM; obs.] IBM's SNA (Systems Network Architecture), an incredibly
losing and bletcherous
communications protocol once widely favored at commercial shops that didn't
know any better (like other proprietary networking protocols, it became
obsolete and effectively disappeared after the Internet explosion c.1994).
The official IBM definition is that which binds blue boxes
together.
See fear and loathing. It may not
be irrelevant that Blue Glue is the trade name of a 3M product that is
commonly used to hold down the carpet squares to the removable panel floors
common in dinosaur pens. A correspondent at
U. Minn. reports that the CS department there has about 80 bottles of the
stuff hanging about, so they often refer to any messy work to be done as
using the blue glue.