Otherwise, the event is reported relative to the focus window. If focus is PointerRoot , the focus window is dynamically taken to be the root window of whatever screen the pointer is on at each keyboard event. The specified focus window must be viewable at the time XSetInputFocus is called, or a BadMatch error results. XSetInputFocus can generate BadMatch , BadValue , and BadWindow errors. The XGetInputFocus function returns the focus window and the current focus state.
Some numeric value falls outside the range of values accepted by the request.
Unless a specific range is specified for an argument, the full range defined by the argument's type is accepted. Any argument defined as a set of alternatives can generate this error. BadWindow A value for a Window argument does not name a defined Window.