The default printer in the XPS document writer. 
They did not have the correct printer selected
when they were trying to print in the lab.

Station I5.

When using Word 2007, a student selected the
APSC101 printer from the list.  It would return a
strange error when he clicked print.  I noticed
that the printer type was "XPS Document Writer"
instead of the xerox phaser 3xxx that it was
supposed to be.  I had him print to APSC Color 1,
which did identify as the xerox.  The student
checked his print credits and found that he was
only charged 1 credit instead of 5.  (He was
worried that selecting the color printer would
charge him 5 credits for his 1 page document.)