The buffer pointer points to the area containing a record to be processed by the exit.
For OPEN Requests: This field contains the character string from the EXIT assembler option. If you did not specify a character string in the EXIT assembler option, this area contains spaces and the buffer length field is set to zero.
For READ Requests: This field points to an empty buffer area.
For PROCESS and WRITE Requests: This field points to the record supplied by the assembler.
All Other Requests: This field is set to zero.
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