How to check what Qt application is run for the first time?

How to check what Qt application is run for the first time? I need for the creation of trial version of my application. Any help is greatly appreciated

Probably use file data and put an I_ran_at_least_one_time file and verify its existence. This file is not accessible to the user and is not changed even if you upgrade the application.

Tags: BlackBerry Developers

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