(1) To execute winplot.ch in Ch Professional Edition, just run winplot.ch

(2) To compile winplot.cpp using Makefile, type
    nmake
to compile winplot.cpp to create winplot.exe in a Ch command shell.
Make sure you have typed
    ch -d
in a Ch command shell to create the startup file _chrc in your home directory.
Then, modify this startup file by uncommeting the code inside this file
to use Visual .NET or VC++ 6.0 C++ compiler with a Ch command shell.

(3) png2bmp.exe is used to convert a png file to bmp file for display in Windows.
You may use ImageMagic or other image file format conversion functions to
replace png2bmp.exe

