... twiki.tmpl is a master template conventionally used by other templates, but not used directly by code. ... Note: It is best to create these templates for your skin. If you TMPL:INCLUDE the default templates, or templates from other skins, when you are defining your own skin, you run the risk that the included file might change and break your skin. ... To see how TWiki looks when no skin is selected, view this topic with a non-existant skin . ... See that skin topic for information how CSS is used. ...