Virtual Hometerm Subsystem (VHS) Manual (G06.24+, H06.04+, J06.03+)

Virtual Hometerm Subsystem (VHS) Manual—429311-002
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1 Introduction to VHS
This manual describes the NonStop Virtual Hometerm Subsystem (VHS). VHS acts as
a virtual home terminal for applications by emulating a 6530 terminal. VHS doesnot
require any change to your application. It runs as a named process with a subtype of
30 (device emulation).
VHS receives messages normally sent to the home terminal, such as displays,
application prompts, COBOL run-time library errors, and Inspect/eInspect or Debug
prompts. The eInspect debugger is supported only on systems running on H-series
Rvus. VHS uses these messages to generate event messages to the EMS collector to
inform operations staff of problems. You can use VHS with operator console
applications, such as ViewPoint or NonStop NET/MASTER, to highlight system or
application problems.
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Benefits of VHS
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VHS Architecture on page 1-2
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VHS Components on page 1-3
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VHS Browser on page 1-4
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Using Multiple VHS Processes on page 1-5
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VHS on a Node on page 1-6
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VHS on a Network on page 1-8
Benefits of VHS
VHS improves operations productivity by helping you avoid three known problems
related to using dedicated physical home terminals:
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Inability of operations staff to find and respond to critical messages because of the
large volume of routine messages.
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Need for constant monitoring of physical home terminals by operations staff.
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Loss of productivity because of a stopped terminal that is waiting for a response.
VHS emulates a terminal, but does not have the disadvantages of a single, dedicated
physical terminal. VHS gives you these benefits over a physical terminal:
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Easy access to critical application messages
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Centralized message handling
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Freeing up of physical terminals
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Automated handling of Inspect/eInspect or Debug prompts
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Improved availability of applications to end users