Page:Xlib - C Language X Interface.pdf/30

 section 9.3).

Both return the minimum number of installed colormaps supported by the specified screen (see section 9.3).

Both return the depth of the root window.

Both return the root window of the specified screen.

 2.3. Generating a NoOperation Protocol Request 

To execute a NoOperation protocol request, use XNoOp.

The XNoOp function sends a NoOperation protocol request to the X server, thereby exercising the connection.

 2.4. Freeing Client-Created Data 

To free in-memory data that was created by an Xlib function, use XFree.