ISSUE PRINT prints displayed data on the first available printer that is eligible to respond to a print request.
For a 3270 logical unit or a 3650 host-conversational (3270) logical unit, it is a printer defined by the RDO TERMINAL options PRINTER and ALTPRINTER, or by a printer supplied by the autoinstall user program.
For a 3270-display logical unit with the printer adapter feature (PRINTADAPTER(YES) option on RDO TYPETERM), used with a 3274 or 3276, it is a printer allocated by the printer authorization matrix. See An Introduction to the IBM 3270 Information Display System.
For a 3790 (3270-display) logical unit, it is a printer allocated by the 3790.
For a printer to be available, it must be in service and not currently attached to a task.
For a 3270 logical unit to be eligible, it must have been specified by RDO TERMINAL options PRINTER and ALTPRINTER or by a printer supplied by the autoinstall user program, and it must have the correct buffer capacity. If the copy feature is also specified (COPY(YES) on RDO TYPETERM definition the printer must be on the same control unit.
If an ISSUE PRINT command is executed, the printer involved must be owned by the same CICS system that owns the terminal that is running the transaction.
For some 3270 displays, it is possible also to print the displayed information without using CICS. See An Introduction to the IBM 3270 Information Display System manual.