+.NC "Definitions"
+.sh 1 "General Terms"
+.ip "Kernel" 5
+The source code or binary module for the Acis Operating System
+(also know as AOS and IBM/4.3).
+.ip "User process" 5
+An instance of a program that is
+running in unprivileged mode, in the unprivileged address space
+commonly know as "user address space", in other words, not
+part of the kernel.
+.ip "IPC" 5
+Interprocess communication, the mechanism by which two different
+user processes send messages to each other.
+.ip "Unix, AOS" 5
+ACIS Operating System, the special testing release of Berkeley Unix 4.4BSD.
+.ip "PCB, pcb" 5
+Protocol control block. Each instance of a protocol machine
+keeps status information, addresses, and in some cases queues
+in a pcb for each connection or socket.
+.ip "Domain" 5
+In the Berkeley Unix environment, a domain is an abstract entity which
+comprises a network architecture, addressing scheme, address format,
+network protocols, and transport protocols.
+.sh 1 "Transport Layer Terms"
+.ip "ISO 8073"
+ISO Draft International Standard 8073, Transport Protocol Specification
+.ip "TP" 5
+The collection of transport
+classes that have been implemented in ARGO, classes 0 and 4.
+Also means the ARGO implementation of TP.
+.ip "TP 0" 5
+Transport class 0.
+.ip "TP 4" 5
+Transport class 4.
+.ip "Transport entity" 5
+Software or hardware that implements the elements of procedure
+described in ISO 8073.
+.ip "Transport user" 5
+User process that make use of the services
+provided by a transport entity.
+.ip "Transport service interface" 5
+The syntax and semantics of the set of procedures, functions, and system calls
+that are invoked by a transport user,
+through which the services of the transport entity are delivered.
+.ip "TPDU" 5
+Transport protocol data unit, a packet that is
+passed from one transport entity to another.
+.ip "TSDU" 5
+Transport service data unit, the logical unit of data that is
+passed from a transport entity to a transport user, or from
+a transport user to a transport entity.
+.ip "CR TPDU" 5
+Connection request TPDU.
+.ip "CC TPDU" 5
+Connection confirm TPDU.
+.ip "DR TPDU" 5
+Disconnect request TPDU.
+.ip "DC TPDU" 5
+Disconnect confirm TPDU.
+.ip "DT TPDU" 5
+Normal data TPDU.
+.ip "XPD TPDU" 5
+Expedited data TPDU.
+.ip "AK TPDU" 5
+Normal data acknowledgment TPDU.
+.ip "XAK TPDU" 5
+Expedited data acknowledgment TPDU.
+.ip "ER TPDU" 5
+Error TPDU.
+.sh 1 "Network Layer Terms"
+.ip "ISO 8473"
+ISO Draft International Standard 8473, connectionless network protocol.
+.ip "CONS"
+Connection Oriented Network Service.
+.ip "COSNS"
+Connection Oriented Sub-Network Service.
+.ip "CLNS"
+Connectionless Network Service.
+.ip "CLNP"
+Connectionless Network Protocol, or ISO 8473.
+.ip "Network Entity"
+Software or hardware that implements the elements of procedure described
+in ISO 8473.
+.ip "Network Service User"
+Software components that make use of the services provided by a network
+entity.
+.ip "Network Service Provider"
+Software components that provide the services of a network entity.
+.ip "NSAP"
+Network Service Access Point. The point at which the OSI network service
+is made available to the network service user by the network service
+provider.
+.ip "NSAP address"
+Information that the network service provider needs to identify an
+NSAP. The source and destination address fields of a CLNP packet
+are NSAP addresses.
+.ip "ES"
+End system. A system running the complete suite of OSI protocols which can
+act as an end point for communication.
+.ip "IS"
+Intermediate system. A system running the OSI layers 1, 2, and 3 which
+can act only a packet router.
+.ip "SNPA"
+The Subnetwork Point of Attachement is the point where a \fIreal\fR
+end or intermediate system is attached to a \fIreal\fR subnetwork.
+.ip "SNPA address"
+Information that a \fIreal\fR subnetwork need to identify a \fIreal\fR end
+or intermediate system. This is commonly referred to as the hardware address.
+.ip "NPDU"
+Network Protocol Data Unit. The unit of data which is exchanged between
+network entities.
+.ip "DT NPDU"
+Normal data NPDU.
+.ip "ER NPDU"
+Error report NPDU.
+.ip "Initial NPDU"
+A NPDU carrying the whole of the user data from an N-UNITDATA request.
+.ip "Derived NPDU"
+a NPDU whose field ar identical to those of an initial NPDU, except that it
+carries only a segment of the user data from an N-UNITDATA request.
+.ip "Segment"
+A distinct unit of data consisting of part or all of the user data provided
+in the N-UNITDATA request and delivered in the N-UNITDATA indication.
+.ip "Segmentation"
+The act of generation two or more derived NPDUs from an initial or derived
+NPDU.
+.ip "Fragment"
+A DoD Internet Protocol term with the same meaning as "segment". Used
+synonymously with "segment."
+.ip "Fragmentation"
+A DoD Internet Protocol term with the same meaning as "segmentation". Used
+synonymously with "segmentation."
+.ip "Reassembly"
+The act of regenerating an initial NPDU from two ore more derived NPDUs.
+.ip "MTU"
+Maximum transmission unit. The maximum size of a packet that can be
+transmitted on a medium or through a protocol.
+For example, the MTU of the TP protocol is 8192 bytes, the MTU
+of and Ethernet device is 1500 bytes, and the MTU of the OSI Network
+service is 512 bytes.
+.ip "Network interface"
+The device used to attach a computer to a network, for example,
+an Ethernet adapter, or a Token Ring adapter.
+This terminology is inherited from BSD Unix.
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