SNA NRJE User/Programmer Reference Manual (30292-90006)

28 Chapter1
Introducing SNA NRJE
Introduction
• Use the workstation console
The user of an advanced workstation can work independently of the
availability of the host system. Most actions relate to the domain of the
workstation and do not enter into the host domain. An advanced
workstation performs many functions without communicating with its
host.
SNA NRJE Emulation of a Workstation
NRJE on an HP 3000 emulates an advanced batch workstation.
The SNA NRJE characteristics resemble an IBM 8100 Distributed
Processing Program Executive (DPPX)/RJE workstation. An 8100
DPPX/RJE workstation is suitable for many distributed processing
applications in many industries. It communicates with IBM
System/370, 43xx, and 30xx, or plug-compatible processors using a 37x5
type communications controller.
8100 DPPX/RJE Overview
When DPPX is used with an SDLC communications link, the 8100 is
operating in an SNA environment. In this case both a workstation
console facility and multiple LU-LU sessions between an 8100 and a
host system are supported.
A DPPX/RJE operator controls each workstation. The operator can
issue interactive DPPX commands to establish a communications link
and to manage input/output sessions or devices. Also, the operator can
enter host system commands and receive host system messages at the
workstation console.The operating system also supports a Programmed
Operator Facility, which allows user-written programs to carry out
operator functions.
DPPX allows a user to input jobs from a card reader, disk files, a
diskette, or magnetic tape. A user issues a DPPX/RJE command to
submit the name of the file to a transmission queue. The queue itself is
a disk file containing the names of files with jobs. When appropriate
operator commands are issued, DPPX/RJE transmits the files named in
the transmission queue to the host system. A user can submit file
names to a transmission queue even when an 8100 is not attached to a
host. Job file names can remain in the queue until an operator sends
the files to the host.
When output returns to an 8100 over an SDLC link, DPPX/RJE
handles the data set in one of two ways. The operator routes the data
set either (1) directly to a printer or punch, or (2) to a disk for deferred
printer or punch output.
SNA NRJE Emulation Overview
SNA NRJE workstations transmit jobs to the host via logical
readers.You configure a virtual reader, which is an MPE spooled