The "WM_NAME" can be the window 's name, class or resource string.
It can also contain wildcards such as "*" or "?", which are matched in the usual
UNIX filename manner. Using the standard X11 xprop(1) command at a
command prompt or the Window Properties menu item entry under
Desktop menu entry will return this (and other) property.
The option[s] is a comma separated list containing all or some of
the keywords found in the Style definition.
If conflicting style options are specified, the last one will be used.