Depending on whether you are testing on Android or iOS devices, TestComplete provides AndroidDevice and AndroidProcess objects or iOSDevice and iOSProcess objects. You can use these objects to obtain information about the device and tested application process running on it, and perform testing actions over them.
Click the image to enlarge it.
For complete information about these objects and their properties and methods, follow the links below:
AndroidDevice objectSee Also
Testing Xamarin.Forms Applications (Legacy)
List of Xamarin.Forms Controls