Canon LBP7100Cn User Manual page 58

The Printer Status Window is displayed automatically under the following situations.
When an error occurs during printing
When the consumables need to be replaced soon during printing
When the consumables have reached the end of their life during printing
You can change the display settings in the [Preferences (Users)] or [Preferences (Administrators)] dialog box in
the Printer Status Window. For more details, see Help.
"How to Use Help"