kort@hounx.UUCP (B.KORT) (11/14/85)
In OS 370, Register 14 contains the return address of the calling program. Hence "Branch to Register 14" (BR14) simply means "Return". The prefix IEF is typical IBM naming. Most system routines begin withh such unpronounceable prefixes as IEF, IEH, IEB, IEM, etc. IEH is pronounced "yech" by diehard system programmers. The executable program IEFBR14 is a no-op; it is usually used in JCL as a dummy step wherein other functions (such as DD statements) can be specified. It is disheartening to note that in 1985, people are still struggling with 2-decade old IBM JCL. I abandonded TSO years ago.