-field of the winprop to a function that receives the client window
-as its sole parameter, and that returns <TT>true</TT> if the winprop
-matches, and <TT>false</TT> otherwise.
+field of the winprop to a function that receives the as its parameters
+the triple <TT>(prop, cwin, id)</TT>, where <TT>prop</TT> is the table for
+the winprop itself, <TT>cwin</TT> is the client window object,
+and <TT>id</TT> is the <A HREF="node7.html#fn:WClientWin.get_ident"><TT>WClientWin.get_ident</TT></A> result.
+The function should return <TT>true</TT> if the winprop matches,
+and <TT>false</TT> otherwise. Note that the <TT>match</TT> function
+is only called after matching against class/role/instance.