Epson STYLUS Photo EX User Manual page 146

Glossary
spool The process by which the printer driver converts the print data
into codes that your printer understands. This data is then sent
to the printer directly or to the print server.
Spool Manager An EPSON software program that converts print data into
codes that your printer understands. See also spool.
Status Monitor An EPSON software program that displays the printer's status,
such as paper out or the amount of ink remaining before
printing.
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