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Mobility Print is an app that you can install on your Mac or Android phone or tablet to add direct printing to the Black Commons and Colour Commons printers from your device's apps.
You should be able to find "Mobility Print" as the app name in your app store, or also under the company name, "papercut".
Do this while in the Library and it should detect the "WebPrint" printer queues for you.
This service is experimental for UPEI so it may be on and off at different times.
When it is not available, use WebPrint instead.