SeeView Server Gateway (SSG) Manual

Introducing SSG
HP NonStop SeeView Server Gateway (SSG) Manual—526356-004
1-5
CSG Overview
1. The CSG DLL sends the request to the CSG on behalf of the client.
2. The CSG sends the request to the SSG on the host.
3. The SSG sends the request to the underlying CI.
4. The SSG blocks the CI response.
5. The SSG replies to the CSG.
6. The CSG replies to the client via the CSG DLL.
CSG Overview
The CSG/SSG API provides workstation client applications with logical end-to-end
connectivity to HP host servers and command interpreters. There are a variety of
CSG/SSG API calls, but the two major categories of API calls are SRVSend and
SSGSend.
SRVSend
The API group provides basic NonStop OS ServerClass_Send access to host server
processes. This group of API calls is used to communicate with true server processes
(processes reading $Receive).
SSGSend
API calls provide access to private CIs, shared CIs, or both on the HP host. A private
CI is a command interpreter assigned to a specific client on a specific workstation. A
shared CI allows multiple clients on multiple workstations to share access to the same
CI in order to realize a performance gain by sharing the response from identical
commands.
The CSG/SSG API also provides end-to-end completion code reporting from all layers
of the communication pipe, including:
•
Low-level errors reported by CSG DLL
•
Transport errors reported by CSG
•
Transport errors reported by SSGCOM
•
Message errors reported by SSGCOM
•
SeeView Server Gateway errors