This Xapp is only available with on-premise deployments.
From the POS Backoffice -> Support menu, select Event Reader.
An initial search screen (like the one shown below) should appear.

The Type criteria specifies the severity of the event: Verbose, Information, Warning, Error, and Critical.
Verbose is used to return all events regardless of severity.
The Source criteria can be used to specify applications that are registered with Windows for the events
The Start Date and End Date limit the results to a specific date range, both fields default to today’s date.
The Description field can be used to search for specific words in the event description.
Click Search to retrieve the results.
For example, here are results of a search filtered using “Customer” in the Description field.

The Export function allows the user to save the event report as a comma-separated values (CSV) file for use in Excel. Once you have a result set that’s filtered as desired, click the Export button. The file is saved as EventReader_yyyy-m-d.csv in the default location, typically the Downloads folder for the user.
The Print function allows the user to save the event report as an Acrobat PDF file for viewing/printing in Adobe Acrobat Reader. Once you have a result set that’s filtered as desired, click the Print button. The file is saved as EventReader.pdf in the default location, typically the Downloads folder for the user.