What am I running on?

Building apps for multiple operating systems from the very same source code imposes unique challenges. Your code might be running on iOS or Android. It only takes two mouse clicks to recompile your app for a different target. Certain features might exist on a given platform and not be there on other platforms. Going further, new functionality is constantly being added to platforms, so you may want to know on which platform and operating system version your app is being executed.

This can be done with the TOSVersion record type defined in the System.SysUtils unit. This record has a class constructor that instantiates all of its fields. The TOSVersion record defines the internal TArchitecture and TPlatform enumerated types and corresponding public class properties to read the current operating system architecture, platform, name, and major and minor numbers.

We can very quickly build a simple app that will log in a memo all of the information from the TOSVersion...