Ch Windows toolkit conforms to the Microsoft Windows application programming interface (API) in C for graphical user interface (GUI). It is a part of Ch Standard/Professional Edition.

With Ch Windows toolkit, Windows application programs written in C can run in Ch under Windows 95/98/Me/NT/2000/XP without tedious compile/link/execute/debug cycles. Applications with user-friendly graphical interface in Windows can be conveniently developed and readily deployed.

This toolkit makes Ch especially suitable for GUI for shell programming and scientific numerical computing. It is very powerful for extending Windows applications using embedded Ch with graphical user interface.