Sorry, do you mean the following ?
<a4j:jsFunction name="processAction" reRender="types"
action="#{adminController.deleteType(type)}" >
<f:param id="type" value="#{type}" />
</a4j:jsFunction>
yes.. and call it like processAction(#{someRowVarProperty}) to identify the row.
OK, thanks. Finally I understand it and the idea in general.