The following calls are used by the server:

SOCKET

Obtains a socket to read from or write to.

BIND

Associates a socket with a port number.

LISTEN

Tells TCP⁄IP that this process is listening for connections on this socket.

SELECT

Waits for activity on a socket.

ACCEPT

Accepts a connection from a client.

The following calls are used by a concurrent server to pass the socket from the parent server task (listener) to the child server task (user-written application).

GIVESOCKET

Gives a socket to a child server task.

TAKESOCKET

Accepts a socket from a parent server task.

GETCLIENTID

Optionally used by the parent server task to determine its own address space name (if unknown) prior to issuing the GIVESOCKET.

The following calls are used by the client:

SOCKET

Allocates a socket to read from or write to.

CONNECT

Allows a client to open a connection to a server’s port.

The following calls are used by both the client and the server:

WRITE

Sends data to the process on the other host.

READ

Receives data from the other host.

CLOSE

Terminates a connection, deallocating the socket.