Internal Program Version: libxcb  1.14

The X protocol C-language Binding (XCB) is a replacement for Xlib
featuring a small footprint, latency hiding, direct access to the
protocol, improved threading support, and extensibility.

The X Resize, Rotate and Reflect Extension (RandR) allows clients to
dynamically change X screens, so as to resize, to change the
orientation and layout of the root window of a screen.

http://xcb.freedesktop.org