If you intend operating CICS® with the extended recovery facility (XRF), there are some more things you must consider when setting up your terminal network. For example, in an XRF environment, SNA VTAM® terminals can be XRF-capable. This means that, if you have specified appropriate options in the TYPETERM definitions, XRF backup sessions can be established in parallel with the active sessions. (For guidance about defining extended recovery attributes for terminals, see the CICS Resource Definition Guide.)
The ability of a terminal to receive this XRF support is not determined by CICS, but by the terminal connection to CICS through ACF/NCP and ACF/VTAM. CICS gives each terminal the best support possible, based on the parameters passed to it from VTAM when the terminal logs on to CICS.
There are extra terminal definition keywords, that enable you to control the manner in which the XRF-capable terminals are supported by CICS.
Non-XRF-capable terminals must have their sessions reestablished to the new active CICS region after a takeover. How you do this depends on the network and the XRF configuration.
For further information about XRF-capable terminals, and non-XRF-capable terminals, see the CICS/ESA 3.3 XRF Guide.
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