Difference between tmsh modify node "session user-enabled" and "state user-up"?

It is somewhat confusing isn't it. I'd have thought that the

tmsh modify ltm node ‘name’ up

From the tmsh reference guide: http://support.f5.com/kb/en-us/products/big-ip_ltm/manuals/product/bigip-tmsh-11-4-0.html.

session user-enabled;

"Establishing a session with a node is establishing the ability of the client to persist to the node when making new connections. When a node is session disabled, clients that have already established sessions with the node may create new connections, but a client that has not already established a session may not create a new one (or make a connection which would create a new session). This feature is used to gently drain connections from a node, typically as part of a maintenance operation. The default value is user-enabled."

state user-up

"Specifies the current state of the node. Use user-down to indicate that the node may not handle any new connections. Use user-up, after using user-down, to indicate that the node may accept new connections."