RSC/MP Programming Manual

4 RSC/MP Sessions
This section describes RSC/MP sessions and describes how to begin and end them.
Session Overview
An RSC/MP session provides a context for the use of servers, transactions, and the
Unsolicited Message Service (UMS). Use a session to perform these tasks:
Communicate with Guardian named processes.
Communicate with Pathway servers through the Pathsend product.
Communicate with Pathway servers through a user-written Intelligent Device
Support (IDS) requester.
Control TMF transactions.
Receive and reply to unsolicited messages.
Beginning and Ending a Session
The RscConnect function must establish a connection before the application calls the
RscBeginSession function. The RscBeginSession function call refers to the connection
handle established by RscConnect.
The session type is specified in the RscBeginSession function with the uSessionType
parameter. Session type constants are:
RSC_ST_INTERPROCESS
RSC_ST_IDS
Note. Earlier versions of RSC/MP supported sessions of type RSC_ST_PATHWAY; this session
type has been discontinued. Old client applications which attempt to create sessions of type
RSC_ST_PATHWAY will create RSC_ST_INTERPROCESS sessions; application compatibility
is not guaranteed.
The RscBeginSession function establishes a session between a client program running
on the workstation and the TDP on the NonStop host.
The RscEndSession function terminates an RSC/MP session between the client
workstation and the NonStop host. An application should call the RscDisconnect
function after calling the RscEndSession function.
See Figure 3-1 and Figure 3-2 for a flowchart that shows these function calls.
HP NonStop Remote Server Call (RSC/MP) Programming Manual — 522360-006
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