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When you plot a set of sheets using the Page Setup Override option in the Sheet Set Manager, AutoCAD automatically sends all the sheets to the plot device as a single job (assuming the plot or PDF driver supports multi-sheet plotting). This behavior can be desirable because it enables you to plot an entire sheet set without interruption. However, it can be undesirable because your colleagues must wait for your entire sheet set to finish plotting before they can sneak in quick plots of their own. Fortunately, the PUBLISHCOLLATE system variable in AutoCAD 2008 enables you to control this behavior. If you change PUBLISHCOLLATE from its default value of “1” to a value of “0”. AutoCAD will process each sheet one at a time so that other plots can automatically interject in the plot spool.
AutoCAD Insider - Autodesk blog by Heidi Hewett