XmInternAtom returns an atom for a given name.
It mirrors the Xlib interfaces for atom management, but provides
client-side caching. When and where caching is provided in Xlib, the
routines will become pseudonyms for the Xlib routines.
display
Specifies the connection to the X server
name
Specifies the name associated with the atom you want returned
only_if_exists
Specifies a Boolean value that indicates whether XInternAtom creates
the atom