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XChangePointerDevice - change which device is the X pointer
- Status XChangePointerDevice(Display *display, XDevice 
- *device, int
xaxis, int yaxis);  
 
- display 
- Specifies the connection to the X server. 
- device 
- Specifies
the device to be used as the X pointer. 
- xaxis 
- Specifies the axis of the
device to be used as the X pointer x-axis. 
- yaxis 
- Specifies the axis of the
device to be used as the X pointer y-axis. 
The XChangePointerDevice
request causes the server to use the specified device as the X pointer.
 The device must have been opened by the client via XOpenDevice or a BadDevice
error will result.  The device must support input class Valuators or a BadMatch
error will result. If the implementation does not support use of the specified
device as the X pointer, a BadDevice error will result.
If the specified
device is grabbed by another client, AlreadyGrabbed is returned.  If the
specified device is frozen by a grab on another device, GrabFrozen is returned.
If the request is successful, Success is returned. 
If the request succeeds,
a ChangeDeviceNotify event is sent to all clients that have selected that
event.  A MappingNotify event with request = MappingPointer is sent to all
clients. The specified device becomes the X pointer, and the old X pointer
becomes accessible through the input extension protocol requests. 
XChangePointerDevice
can generate a BadDevice or a BadMatch error. 
- BadDevice 
- An invalid
device was specified.  The specified device does not exist, has  not been
opened by this client via XOpenInputDevice, or is already one of the core
X input devices (pointer or keyboard).  This error may also occur if the
server implementation does not support using the specified device as the
X pointer. 
- BadMatch 
- This error may occur if an XChangePointerDevice request
was made  specifying a device that has less than two valuators, or specifying
a  valuator index beyond the range supported by the device. 
XChangeKeyboardDevice
Programming With Xlib 
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