X11 two GPU

Display displays[2];

displays[0] = XOpenDisplay(":0.0");
displays[1] = XOpenDisplay(":1.0");

[...]

window[0] = XCreateSimpleWindow(displays[0], XDefaultRootWindow(displays[0]),
0, 0, width, height, 0, 0, 0);
window[1] = XCreateSimpleWindow(displays[1], XDefaultRootWindow(displays[1]),
0, 0, width, height, 0, 0, 0);


however i don't understand this: on a system with two X11 servers (two gpus) without xinerama, if i want that window[0] goes to the first xserver and the second xserver, what functions should i call with Qt?

None, this has nothing to do with Qt.

Quote:

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Originally Posted by ChrisW67

None, this has nothing to do with Qt.

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How can I show QWidget between two X11 Server?

Two separate instances of your Qt program with different values of the DISPLAY environment variable or -display command line option. QApplication binds to a single X display. You can pass a particular display (non-default) to the constructor but you can only have one QApplication object in the program.