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.