Epson Stylus Pro 4400 Reference Manual page 168

2. Click Remaining Ink Level, or click Utility. If you click
Utility, click EPSON StatusMonitor in the Utility dialog.
The EPSON StatusMonitor dialog appears.
EPSON StatusMonitor informs you of the amount of ink
remaining and the free space of the maintenance tank as of the
time the StatusMonitor was opened. To update the information,
click Update.
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Printing with Mac OS 9.x