Xerox 2101 ST Digital Copier/Printer プリント

In Command WorkStation LE, a blue vertical line indicates the destined location of 
the selection you are dragging. In Command WorkStation, the cursor changes to 
reflect the result of your action:

Multiple levels of undo are available; use the Undo control to undo all the way back to 
your first edit. There is a Redo control.

After you drag pages from one Preview window to the other, the first window is 

designated as the source, and the other window the destination. During a merging 
session, you can drag pages only from the source window to the destination window, 
not vice versa. To merge pages in the opposite direction, you must save your current 
changes to the destination window and begin a new merging session.

Repeat step 3 to merge pages from the new source job.