Playing with portletURL in Liferay

With out tld :
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1.To get currentURL :
PortletURL url = PortletURLUtil.getCurrent(renderRequest, mimeResponse or renderResponse)
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2.To make clone of a URL :
PortletURL url = PortletURLUtil.clone(portletURL, mimeResponse or renderResponse)
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3.creating PortletURL from actionResponse :
PortletURL renderURL = ((ActionResponseImpl) actionResponse).createRenderURL();
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4.creating PortletURL from renderResponse :
a.For RenderURL:
PortletURL renderURL = renderResponse.createRenderURL();
b.For actionURL:
PortletURL actionURL = renderResponse.createActionURL();
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5.Using TLD's in Liferay :
a.

<portlet:renderURL windowState="<%= WindowState.ur_state.toString() %>">
<portlet:param name="param_name" value="param_value" />
<portlet:param name="param_name" value="param_value" />
</portlet:renderURL>

b.
<portlet:actionURL windowState="<%= WindowState.ur_state.toString() %>">
<portlet:param name="param_name" value="param_value" />
<portlet:param name="param_name" value="param_value" />
</portlet:actionURL>