Differences between PortletURL and PortalNodeURL?

[pmn92]

They both supports render and action urls - can you explain differences between the two and when to use one or the other - what's the feature behind each of them?

[pmn92]

The code is unreadable, easier to try ...

PortletURL createActionURL()
... Window?action=1
with PortletMode set to EDIT
... Window?action=5&mode=edit
with PortletMode set to VIEW
... Window?action=5&mode=edit
with WindowState set to MAXIMIZED
... Window?action=d&windowstate=maximized&mode=view

PortalNodeURL createActionURL(node)
... Window?action=2

Problem is action=2 does not trigger anything, so why does it exists?