Pathway/iTS TCP and Terminal Programming Guide

Introduction to TCP and Terminal Application
Programming
Compaq NonStop™ Pathway/iTS TCP and Terminal Programming Guide—426751-001
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Other Fundamentals of NonStop™ Himalaya
Systems
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The PATHMON process can dynamically create additional copies of server
processes at times of peak demand and delete the additional servers when activity
slows again.
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You can add copies of requester and server programs to your Pathway application to
maintain fast response time when the number of users or terminals increases.
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You can distribute processes such as TCPs and servers close to the resources they
manage, reducing interprocess communication time within a network.
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You can distribute requesters and servers to less active processors if peak activity on
a particular processor is affecting throughput or response time.
System Security
The Guardian operating environment includes basic mechanisms for controlling access
to files, whether they are data files or program files. Because NonStop™ TS/MP and
Pathway/iTS run in the Guardian operating environment, Guardian system security
parameters also apply to Pathway users and processes. In addition, you can supplement
the security features of the Guardian environment with the Safeguard product, which
provides authentication, authorization, and auditing capabilities for Guardian files.
Scalability
Your organization must be able to expand its transaction processing system as its
operations evolve and its technical requirements change. NonStop™ Himalaya systems
are expressly designed to support incremental, modular expansion, allowing you to
increase the size and processing power of your transaction processing system by:
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Adding hardware and application resources to your existing system
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Linking individual Pathway applications into a single network or adding more
Pathway applications to an existing network
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Supporting an open systems architecture in which standards-based networks as well
as devices and systems from other vendors can be connected to your NonStop™
Himalaya system
Distributed Processing
Data communications technology allows organizations to extend their online operations
over long distances to form global networks and to support distributed processing. The
Pathway environment, in conjunction with the Compaq NonStop™ Kernel operating
system, allows you to distribute application processes within a single system.
Additionally, NonStop™ TS/MP, NonStop™ TM/MP, and Pathway/iTS, in conjunction
with the Expand networking software, allow you to spread processes, data, and
transactions across a network of NonStop™ Himalaya systems. The coordination of
transactions among application servers residing within an Expand network and possibly
accessing different resource managers (Compaq NonStop™ SQL/MP and Enscribe) is
known as distributed transaction processing (DTP).