Attention Identifier (AID) indicates which method the terminal user has used to initiate the transfer of information from the terminal to CICS. Some examples of AIDs are PF keys, PA keys, ENTER key, CLEAR key, etc. The EIBAID of the EIB contains the AID code of the most recently used AID.CICS also provides the standard list in the form of a copy library called DFHAID, so that a program can use this list by specifying this copy library in the program. The DFHAID copy member contains such AID codes as DFHENTER for ENTER key, DFHCLEAR for CLEAR key, DFHPA1 - 3 for the PA keys and DFHPF1-24 for the PF keys.

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