IPX/SPX Configuration and Management Manual

Introduction to NonStop™ IPX/SPX
IPX/SPX Configuration and Management Manual—425731-001
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Remote Server Call (RSC) Services
RSC allows you, as a NetWare workstation user, to access TS/MP on the operating
system. Clients (requestors) send transaction messages to the Pathway servers. The
Pathway servers satisfy clients’ requests (for example, for access to databases) and send
the responses back to the clients.
On the workstation, the Compaq RSC software provides an application program
interface (API) to communicate with the NonStop™ Himalaya S-series server. The API
supports the same suite of functions for use over NonStop™ IPX/SPX as it does over
TCP/IP; the details of underlying protocols are hidden. For Windows applications, the
API is installed on the workstation as a dynamic link library. The API supports most
workstation-based languages, development tools, and applications. You can use any
development environment that generates standard C-language calling sequences.
In addition to providing access to TS/MP, RSC supplies a Communications Subsystem
(CSS) that enables communication over NonStop™ IPX/SPX. Concurrent RSC sessions
can share a single communications session.
RSC also provides workstations with access to client-server online transaction
processing (OLTP) through Compaq Tandem Pathway Open Environment Toolkit
(POET) and Compaq Tandem Dynamic Data Exchange (DDE) Gateway on the
NonStop™ host. POET and DDE Gateway simplify the development of high-volume,
client-server OLTP applications for workstations. POET allows interaction through a
Microsoft-standard interface called Dynamic Link Library (DLL). DDE Gateway allows
interaction through DDE, another Microsoft-standard interface.
The RSC client can initiate Compaq Tandem NonStop™ Transaction Manager/MP
(NonStop™ TM/MP) software to protect the integrity of transactions. TM/MP ensures
that every transaction updates all relevant database nodes. An RSC client has access to
all TM/MP verbs.
Figure 2-7. RSC for Workstations
007CDT .CDD
NonStop
TM
Himalaya
S-Series Server
NetWare LAN
(Ethernet or Token-Ring)
PC
(Windows)
NonStop
TM
IPX/SPX
TDP
RSC API
NonStop
TM
IPX/SPX
NonStop
TM
TS/MP
RSC Application
POET
DDE
Gateway