There are various books available about programming for Windows. I sympathize with your puzzlement :: after I had programmed for mainframes and MSDOS for donkey's years, where everything happens in one succession, transferring to Windows and all its messages and windows etc and registerable window-functions and qwertyuiop alone knows what was like knowing how to drive a car and suddenly being sat down at the controls of a UFO. - The download zipfiles for my utilities all contain the source forms (for Borland C++ v4.52). - Apart from that, it is a matter of learning how to program in C++.