Historically, use of the term 'hijacked' is without warrant. There are and have always been two sorts of ABEND codes, viz.,
[IBM's] SYSTEM ABEND codes, which have the format: majuscule 'S' followed by three hexadecimal digits, e.g., S0c7, and [other people's] USER ABEND codes, which have the format: majuscule U followed by four decimal digits, e.g., U4096. John Gilmore, Ashland, MA 01721 - USA
