When set to 0, both primary and secondary documents are printed as a part of the same windows printing job.
When set to 1, primary and secondary documents need are printed using separate windows printing jobs.
This INI setting can be used when the print driver and print device cannot modify job parameters like paper source, size, orientation, and duplexing after a job has been initiated.
CAUTION:
This INI setting should only be used when absolutely necessary, as it dramatically degrades performance. Using a different print driver or device are preferred alternatives.