(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 thATBlue Glue is also a 3M product commonly used to hold down carpets in dinosaur pens. [Jargon File] (1994-11-23)