Window without border problems

Hi forum,
I need a window without a border to make a custom border.
But when I maximizes a window without a border, it will fill the whole screen.
I want it to only fill the whole screen beneath the taskbar.
How should I setup the window correctly?

Regards,
Simon H.A.
These sorts of questions are almost always best asked in the OS-specific forums because C++ does not have a native GUI toolkit. And the answer will likely be different for Mac, Unix and Windows.
Okay, I will move it to another forum.
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