https://invisible-island.net/xterm/xtoolkit/
XtCreateWindow - window creation convenience function
#include <X11/Intrinsic.h>
void XtCreateWindow(Widget w, unsigned int window_class, Visual *vis-
ual, XtValueMask value_mask, XSetWindowAttributes *attributes);
attributes
Specifies the window attributes to use in the XCreateWindow
call.
value_mask
Specifies which attribute fields to use.
visual Specifies the visual type (usually CopyFromParent).
w Specifies the widget that is used to set the x,y coordinates
and so on.
window_class
Specifies the Xlib window class (for example, InputOutput,
InputOnly, or CopyFromParent).
The XtCreateWindow function calls the Xlib XCreateWindow function with
values from the widget structure and the passed parameters. Then, it
assigns the created window to the widget's window field.
XtCreateWindow evaluates the following fields of the Core widget struc-
ture:
o depth
o screen
o parent -> core.window
o x
o y
o width
o height
o border_width
X Toolkit Intrinsics – C Language Interface
Xlib - C Language X Interface
X Version 11 libXt 1.1.5.2 XtCreateWindow(3)