Houston Automatic Spooling Priority

HASP was developed by IBM Federal Systems Division contractors at the Lyndon B. Johnson Space Center in Houston.

HASP was a program that ran on a mainframe, and performed functions such as: scheduling, control of job flow, spooling and printing/punching.

HASP had no support for IBM System/360 Operating System Remote Job Entry, 360S-RC-536, but provided roughly equivalent facilities of its own.

Don Greb of Mellon Bank carried it forward into JES2 multi-access spool (IBM's formal support of HASP in MVS).

Over 350 copies of the HASP II V4 shared spool mods were distributed around the world by Mellon Bank.

A modified version of HASP was used to provide batch spooling and remote job entry services for the Michigan Terminal System during the late 1960s, 1970s, and 1980s.

[4][5] HASP bypassed most operating system services with code specially tailored for efficiency.

Multi-leaving is "fully synchronous, pseudo-simultaneous, bi-directional transmission of a variable number of data streams between two or more computers utilizing binary-synchronous communications facilities.