Software processes were implemented using non-preemptive multiprogramming.

The Multi-Programming in the acronym of language name point to this.

MPE (Multi-Programming Executive) is a business-oriented minicomputer operating system made by Hewlett-Packard.

MUMPS (or M), a computer programming language (Massachusetts General Hospital Utility Multi-Programming System)

The operating system, known as MPE (for Multi-Programming Executive), loads code segments from program files and segmented Library (SL) files as needed, up to 256 segments in one process.

System Programming Language or SPL is also the name of a specific language on the HP 3000 computer series used for its operating system HP Multi-Programming Executive and other systems software.

During his final year at the university, Sassenrath joined Hewlett Packard's Computer Systems Division as a member of the Multi-Programming Executive (MPE) file system design group for HP3000 computers.

The 3000 series operating system was originally styled the Multi-Programming Executive, MPE (later called MPE XL and then, after POSIX compliance was added in versions 5.0-5.5, MPE/iX).

MUMPS (Massachusetts General Hospital Utility Multi-Programming System, later: 'Multi-User Multi-Programming System') or alternatively M is a general-purpose programming language that provides ACID (Atomic, Consistent, Isolated, and Durable) transaction processing.