creating a link to a portlet

Displaying a portlet is done by 

Portlet portlet = PortletFactory.getPortlet("NameOfPortlet");
base.addElement(portlet.getContent(aRunData));

then, how do you create a link to another portlet using the 
org.apache.ecs.html. API's?

For instance, I looked through the link class which has setHref(some string)
however, in my case, i dont think this will work, since I need to pass the RunData obj as well... Any pointers?