MDI WIndowsinwindows

[JamesBowen]

20 Years too late.

It is possible to Parent Child MDI windows (not using GUI for .NET).
It's using Win32 API commands using GetParent() and SetParent() API functions.

It's not something I would undertake lightly as you have to handle all kinds of edge case scenarios with maximizing, resorting and resizing the parent window and maintaining track of all the child windows handles.

 

[PatrickTingen]

Question is (even after 20 years) why one would want this. I cannot imagine this being a comfortable user experience.
For my swimming club, I work with a system to control memberships, and that is one that works with MDI.
If you need some inspiration for new Dutch swear words, just watch me use this application ...