(SNA) IBM' s proprietary high level networking protocolstandard, used by IBM and IBM compatible mainframes.Also referred to as "Blue Glue", SNA is a bletcherous protocol once widely favoured at commercial shops.The official IBM definition is "that which binds blue boxes together."It may be relevant that Blue Glue is also a 3M product commonly used to hold down carpets in dinosaur pens.[Jargon File](1994-11-23)