Digital Equipment 300 Series AXP Reference Manual page 289

login command
The command issued at the operating system prompt that allows
access to and communication with the system.
longword
Four contiguous bytes (32 bits) starting on any addressable byte
boundary. Bits are numbered from right to left, 0 through 31.
The address of the longword is the address of the byte containing
0. A naturally aligned longword has an address evenly divisible
by 4.
loopback connector
An Ethernet or communications connector used on the back of
the system unit when testing the Ethernet subsystem or the
synchronous/asynchronous communications adapter.
loopback tests
Diagnostic tests used to isolate a failure by testing segments of a
particular control or data path.
machine check
An operating system action triggered by certain system
hardware-detected errors that can be fatal to system operation.
Once triggered, machine-check handler software analyzes the
error.
Maintenance Operations Protocol
The transport protocol for network bootstraps and other network
operations.
mass storage device
An input/output device on which data is stored. Typical mass
storage devices include fixed disks, compact discs, magnetic
tapes, and diskettes.
Mb
See megabit.
MB
See megabyte.
Glossary–17