A basic definition for the orderList that sorts a collection of strings would be as shown here:

<p:orderList id="simple" value="#{orderListBean.countries}"
  var="country" itemLabel="#{country}" itemValue="#{country}" />

The visual output of the component will be as shown here:

To define a header on top of orderList, a facet with the name caption should be provided as shown here:

<p:orderList id="withCaption" value="#{orderListBean.countries}"
  var="country" itemLabel="#{country}" itemValue="#{country}">
  <f:facet name="caption">
    Countries
  </f:facet>
</p:orderList>

With the controlsLocation attribute, we can control the position of the controls. The default value is left; the other possible values are right and none.