How can I make a dialog as another OpenGL window?

I understand how I could make another window, but how do I set it for fixed size and position and disable the close box?

This isn’t really an OpenGL question. This is a window-system question. And the answer varies based on which window system (or window system abstraction layer) you are using. (MSWindows, Linux, GLFW, SDL, GLUT, etc.)

Actually what I want is an OpenGL window. Because I want to have text and images;

But you presumably know how to make one of those, right? Getting rid of close boxes and setting it to a fixed-size position is a matter of your windowing API, not of OpenGL.

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