Epson Stylus Pro 4000 Reference Manual page 116

Viewing information in EPSON Status Monitor 3
EPSON Status Monitor 3 provides the following information:
Current Status
EPSON Status Monitor 3 provides you with detailed printer
status information, a graphic display, and status messages. If the
ink runs low or out, How to appears in the EPSON Status
Monitor 3 window. Click How to to display cartridge
replacement instructions.
Information
EPSON Status Monitor 3 provides a graphic display of the
amount of ink remaining.
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Printing with Windows