List of Platform-dependent Functions

Libraries that are not fully cross-platform:

InAppPurchase WindowsLinuxMacOS

Individual commands that are not fully cross-platform:

BatteryLevel WindowsLinuxMacOS  
DeviceAlwaysOn WindowsLinuxMacOS  
DeviceBrightness WindowsLinuxMacOS  
DeviceInfo WindowsLinuxMacOS  
VibrateDevice WindowsLinuxMacOS