Terminating a Connection
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There are two ways to terminate a connection using modem commands: You can close the connection, or abort it. The two are not the same, when it comes to TCP connections.
Closing a Connection
The Close Connection (CC) instruction uses the proper termination sequence for TCP connections (FIN-ACK-FIN-ACK), and thus closes the connection in an orderly fashion. It is recommended to use this instruction.
Aborting a Connection
The Abort Connection (CA) instruction uses an RST packet to terminate a TCP connection. This is one-sided termination, and is usually less recommended.
Terminating UDP "Connections"
UDP is a connectionless protocol. The data "connection" the DS uses is merely a stream of packets, as described under UDP Data "Connections". Thus, you can either abort or close such a "connection" -- the action performed is identical in both cases.