ATPCloseSocket
short atpSocket; socket number to close
recommended that you use the preferred call, PCloseATPSkt instead. ATPCloseSocket closes the responding socket whose number is specified by atpSocket. It releases the data structures associated with all pending,
asynchronous calls involving that socket; these pending calls are completed
immediately and return the result code sktClosed.
atpSocket contains the socket number of the socket to close
noErr (0) No error
noDataArea (-1104) Too many outstanding ATP calls