what's the definition of struct USER_INFO in RL_TCPnet

Hi guys, Since the single TCP Connection is success using RL_TCPnet firmware, I want to keep go in the Multiple TCP Connections. The follow link is the description of Multiple TCP Connections on KEIL...
what's the definition of struct USER_INFO in RL_TCPnet

Hi guys, Since the single TCP Connection is success using RL_TCPnet firmware, I want to keep go in the Multiple TCP Connections. The follow link is the description of Multiple TCP Connections on KEIL...
what's the definition of "LOCALM" in RTX (RL-TCPnet)

I want to modify the default gateway of the system, RTX provide "LOCALM" for modifying the relevant parameter. But I cannot find the definition of "LOCALM" so that cannot find the member of the instance...
what's the definition of "LOCALM" in RTX (RL-TCPnet)

I want to modify the default gateway of the system, RTX provide "LOCALM" for modifying the relevant parameter. But I cannot find the definition of "LOCALM" so that cannot find the member of the instance...
What's definition for S:, T:, U: and V: ?

I had found this article from Keil's Knowledgebase: http://www.keil.com/support/docs/2397.htm However, I can't find out the definitions for those prefiex S:, T:, U: and V:. Can anyone help...