Routing client requests in a two-tier (gateway-less) environment requires use of the Server Option context handler. The context handler is a conversational transaction that matches client application procedure calls to Server Option RPCs, thereby enabling a client application to access the Server Option directly (in two-tier mode) without needing to route transactions through a gateway.
For each client application logged in to the Server Option, a context handler (SYCH) transaction instance receives client requests and manages the connection between the client application and the Server Option. In addition, CICS activates the context handler transaction instance to handle a transaction abend. An active context handler instance terminates when its associated client application logs out.
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