mGBA is an excellent new generation of Nintendo Game Boy Advance emulator with very high degree of completion (most games can be simulated perfectly) and pretty fast running speed. It was thoroughly written in C language by Jeffrey Pfau, and first released in 2013 as an open-source freeware for multiple platforms (Windows, Mac OS X, Nintendo 3DS, Wii, PlayStation Vita and many other Unix-like OS).

Keil C51 is an easy-to-learn and easy-to-use C language Single Chip Microcomputer (SCM) programming software (IDE) for all 8051 Microcontroller devices. It is suitable for each level of developers, whether he is a professional application engineer, or a student who just started to study the embedded software development.

About how hard it is on earth for learning MFC, this should vary from person to person. If you are experienced programmers started from the base Windows OS, you'd likely have been a member of programmers developing the MFC class libraries; on the contrary, if you just have learned few years of Windows programming, then you may have not any knowledge on the underlying system. In the latter case, you must have one book on your desk for reference anytime (every technology needs this). For MFC, it will be Programming Windows with MFC.