368IMS Connectivity in an On Demand Environment: A Practical Guide to IMS Connectivity
function specifies the address of a 4-byte field in the user-defined storage that contains
the function call. The function call must be left-aligned and padded with blanks, such as
GUbb.
AIB specifies the address of the application interface block.
19.4.3 The application interface block (AIB)
The application interface block (AIB) is used by application programs to issue IMS DL/I calls
using a PCB name instead of a PCB address, or to issue calls that are not associated with a
PCB. It provides a standard mechanism for IMS and the application to exchange information. ...
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