Apple Color LaserWriter 12/600 PS - Manual (Page 107)

Determining the status of a printer by looking at its icon
You can tell the status of a printer by looking at its desktop icon:
Monitoring printing
If you are using background printing, you can use the desktop printer features
to monitor and control the documents that are waiting to print.
1 Double-click the desktop printer icon you’re interested in.
93 Mac OS Users
Plain icon indicates a printer
that is not currently chosen
for printing.
Default icon indicates the printer
you have currently chosen to
print on.
Printing icon indicates a
document is printing on
this printer.
Stopped icon indicates you have
stopped the print queue.
Error icon indicates there is an
error on this printer. Double-click
the icon to see a message.
Disabled icon indicates the
desktop printing extension is turned
off, the LaserWriter extension is no
longer in the Extensions folder, or
this icon is a copy of an active icon.