HP-UX SNAplus2 General Information (October 1998)

34 Chapter 2
Introducing SNAplus2
SNAplus2 Resources
CSV applications
Common Service Verb (CSV) applications provide
utility functions such as character translation and
application trace control.
The APIs for APPC, CPI-C, LUA, HLLAPI, NOF and CSV are included
both on SNAplus2 systems and on HP-UX and Windows clients.
HLLAPI, NOF and MS APIs are only available on HP-UX systems (both
servers and clients). Many third-party Windows emulation programs
supported by SNAplus2 include HLLAPI support.
For more information, see “Client/Server Support”.
SNAplus2 Passthrough Services
Passthrough services support communication between a host and
computers on a LAN, making it possible to reduce the number of
communication links to the host and simplify configuration. In addition,
the TN server feature can provide access to TN3270 users in a TCP/IP
network.
Dependent LU Requester
Normally, a dependent LU session requires a direct communications link
to the host computer. If many nodes (including a host node) are
connected together in an APPN network, some of them might not have a
direct connection to the host, but only an indirect connection through
another node; it is not possible to establish dependent LU sessions to the
host from these indirectly connected nodes.
Dependent LU requester (DLUR) is an APPN feature designed to
overcome this limitation. DLUR on an APPN node (such as a node
running SNAplus2) works in conjunction with dependent LU server
(DLUS) at the host, to route sessions from dependent LUs on the DLUR
node across the APPN network to the DLUS host. The route to the host
can span multiple nodes, and can take advantage of APPN's network
management, dynamic resource location, and route calculation facilities.
DLUR must be available on the node where the LUs are located, and
DLUS must be available on the host node, but there is no need for DLUR
to be available on any intermediate nodes in the session route.