X-property-set! -- Set X property NAME on window WIN to VALUE.
X-property-get -- Get X property NAME of window WIN.
X-property-delete! -- Delete X property NAME of window WIN.
X-properties -- Returns a list of WIN's X property names.
string->X-atom -- Returns an X atom representing STRING.
X-atom->string -- Returns the string represented by ATOM.
X-get-selection-owner -- Return the window that owns the selection denoted by ATOM.
X-convert-selection -- Ask the owner of selection SELECTION to provide its value.