Tally T5023+ Programming Manual page 214

Basic commands for document processing Additional commands (Printer)
Use:
Control when printing lists on documents where the document length is
unknown.
For each print line the program generates a control point with a uniquely marked
parameter (for example, line number). In the case of an error the lines not yet
printed are deleted in the printer and in the system driver. Using the control
points reported back the program can now determine the rerun point after the
end of the paper. Thus the data for the next document can be formatted and
transferred to the printer.
As the printing unit automatically returns to the ONLINE status, the operator can
continue work by inserting a new document.
The error message via the operating panel of the printer and the use of the
STOP key by the operator are unnecessary.
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T5023/5023+ - Programming Guide