Writing-MiniGUI-Apps-for-64-bit-Platforms.md

@@ -20,6 +20,18 @@ Table of Contents
 
 In MiniGUI 3.2.0, we enhanced MiniGUI to support 64-bit platforms.
 
+Although many embedded devices or IoT devices are still using 32-bit
+processors, we often need to develope MiniGUI apps on a desktop computer
+(almost all desktop computer are now using 64-bit CPU), and then build
+the code for the target system through a cross compiler. Therefore,
+the code of a MiniGUI App needs to be portable, regardless of whether
+the target system is 32-bit or 64-bit, or even a big-endian or
+little-endian system.
+
+This document focuses on some of the changes that MiniGUI introduces to
+support 64-bit systems and what you need to be aware of when writing
+portable code.
+
 ## Changes of Data Types
 
 ### Changes of handle types